2026 Race regulations

The Mont-Blanc Marathon is a sporting event organized by the Club des Sports de Chamonix, a non-profit association under the law of 1901.

These regulations apply to the following events: 90km du Mont-Blanc, 42km du Mont-Blanc, 23km du Mont-Blanc, Kilomètre Vertical du Mont-Blanc, Duo étoilé, Young Race Marathon, 10km du Mont-Blanc, Mini-Cross du Mont-Blanc and the Trail Camp (Salon du Marathon du Mont-Blanc). It has been drawn up in correlation with the FFA (Fédération Française d'Athlétisme) regulations for off-stadium races.

Consult the FFA regulations in PDF

The organizers would like to draw runners' attention to the fact that, depending on the measurement systems and settings used, race routes may give different results.

90km Mont-Blanc

• Semi-autonomous ULTRA-TRAIL, with 8 full refreshment points.
• A fallback course is available in the event of bad weather (78 km and around 5000 m of positive and negative altitude difference).
• Open to Espoir category and above.
• Limited to 1000 runners.
• Maximum time 24h00.
• Gifts: Gift and Finisher medal at the end of the race.
• Mainly technical mountain trails between 1500 m and 2500 m altitude, with finish in the center of Chamonix.
• UTMB minimum entry requirement: 450

42km Mont-Blanc

• Semi-autonomous TRAIL, including 3 full feed stations.
• Distance of 42 km with a positive and negative altitude difference of 2540 m.
• Open to Espoir category and above.
• Limited to 2300 runners.
• Maximum time 10h00.
• Gift: Finisher medal at the end of the race.
• Course takes in mountain trails between 1000 m and 2200 m altitude, with a finish at Chamonix's Place du Triangle de l'Amitié.
• UTMB minimum registration index: 350

23km Mont-Blanc

• Semi-autonomous SHORT TRAIL, including 2 full refreshment points.
• 23km distance with a positive altitude difference of 1680m and a negative altitude difference of 870m.
• Open to Espoir category and above.
• Limited to 2000 runners.
• Maximum time 6h00.
• Gift: Finisher medal at the end of the race.
• Course takes in mountain trails between 1000m and 2000m altitude, with a finish at Planpraz (2000m altitude).
• UTMB minimum entry requirement: 270

Mont-Blanc 10km

• Discovery trail, without intermediate refreshments.
• 10 km on the cross-country ski trails, with a vertical drop of 325m positive and negative.
• Open to Cadets and above.
• Gift: Finisher medal at the end of the race.

Duo étoilé

• TRAIL with 2 full refreshment points.
• A duo race, with both participants having to pass the timing points and the finish line together.
• Distance 21 km with a positive and negative altitude difference of approx. 1450 m.
• Open to Espoir category and above.
• Maximum time 6h30.
• Gift: Finisher medal at the end of the race.

KM Vertical du Mont-Blanc

• Race against the clock.
• Distance of 3.8 km with a positive vertical drop of 1000 m.
• Open to juniors and above.
• An alpine race, the end of the course is an aerial via ferrata (steps, cables, handrails...), with a finish at 2000m (Planpraz).
• Gift: Finisher medal at the end of the race.

The Young Race

• Discovery trail reserved for U18 and U20 categories.
• U18 category: 7 km with a positive and negative altitude difference of 644 m / finish refreshments.
• U20 category: 13 km with a positive and negative altitude difference of 1,200 m / intermediate and finish refreshments.
• The course follows mountain trails at altitudes of between 1000m and 2200m, starting and finishing in Chamonix.
• Gift: Finisher medal at the end of the race.

Mini-Cross du Mont-Blanc

• Discovery race for children.
• No timing, no ranking based on speed.
• Course from 800m to 3km depending on age (Ecole d'athlétisme to Minimes categories), taking place in the Bouchet woods.
• Gift: Finisher medal at the end of the race.

Registration for the Mont Blanc Marathon is open to licensed and non-licensed runners of all nationalities, whose age corresponds to the FFA category/distance criteria.

More information on FFA categories

Each competitor must be in possession of personal accident insurance covering search and evacuation costs in France and Switzerland (90km). Such insurance can be taken out withAssur-Connect, for one, two, seven days or one year. Helicopter evacuations in Switzerland are subject to a fee, as are private helicopter evacuations in France. The choice of evacuation depends exclusively on the organization, which will always give priority to the safety of the runners. It is therefore up to each runner to check that his or her insurance covers these arrangements (the Mont Blanc Marathon organization is not authorized to provide information on your coverage).

Runners in possession of a valid FFA license or Pass J'aime courir who have chosen the Personal Accident option when purchasing their license or pass are automatically covered by the insurance of the Fédération Française d'Athlétisme.

Take out personal accident insurance

Age categories 2026 :

• U10 Eveil Athlé : 7 to 9 years old / 2017 to 2019
• U12 Poussins : 10 to 11 years old / 2015-2016
• U14 Benjamins : 12 to 13 years old / 2013-2014
• U16 Minimes: 14 to 15 years old / 2011-2012
• U18 Cadets: 16 to 17 years old / 2009-2010
• U20 Juniors: 18 to 19 years old / 2007-2008
• U23 Espoirs: 20 to 22 years old / 2004 to 2006
• Seniors: 23 to 34 years / 1992 to 2003
• Masters: 35 and over / 1991 and earlier

Masters :

• M0 : 1991-1987
• M1 : 1986-1982
• M2 : 1981-1977
• M3 : 1976-1972
• M4 : 1971-1967
• M5 : 1966-1962
• M6 : 1961-1957
• M7 : 1956-1952
• M8 : 1951-1947
• M9 : 1946-1942
• M10: 1941 and earlier

Registrations are made exclusively over the Internet, via secure credit card payment. Registration fees include all services described in the present regulations.

By registering, each runner makes the following personal commitments:

• I declare that I have fully understood the rules and ethics of the race.
• I understand and accept the conditions of participation set out in these rules.
• I undertake to abide by the rules in all respects.
• I declare that I hold personal accident insurance covering rescue, search and evacuation costs in France and Switzerland.
• I declare that I have informed myself of any medical contraindications that may apply to me and, consequently, release the organization from any medical problems that may arise during the event as a result of negligence on my part.
• I declare that I have completed the Health Prevention Course (PPS), or a health questionnaire for minors, and that I have informed myself of any medical contraindications that may apply to me, and therefore release the organization from any medical problems that may arise during the event.
• I agree to submit to any fixed or random checks that may be carried out along the route, and to any decisions that may be taken against me.

All registrations are personal, firm and final, and cannot be reimbursed for any reason whatsoever (except for those who have taken out cancellation insurance at the time of registration):

• No transfer of registration, nor any exchange, donation or resale of race numbers between individuals is permitted for any reason whatsoever, before, during or after the event.
• Any exchange of race numbers will result in immediate disqualification of the runner and a ban on re-registration for Mont Blanc Marathon races for a period of 10 years.
• Any person transferring their race number or registration to a third party will have their registration cancelled and will be held responsible in the event of an accident occurring or caused by the third party during the event. The organization declines all responsibility in the event of an accident of this type.
• Any person holding a race number or registration acquired in breach of the present regulations will be disqualified without reimbursement.
• Any runner caught in the act of exchanging, donating or reselling a race number will have his or her registration cancelled without refund, and will be barred from re-registering for Mont Blanc Marathon races for a period of 10 years.

In application of the law of March 2, 2022 aimed at democratizing sport in France, the French Athletics Federation has decided to replace the requirement for a medical certificate of no contraindication, with an educational and information course on the health risks associated with the practice of athletics, called the "(or "PPS").

Already applicable to all FFA adult licensees since September 2023, this obligation now applies to all practitioners adults who wish to register for a race, who will have to complete the Health Prevention Course within three (3) months prior to the event concerned.

Minors, on the other hand, are still required to present a valid license or complete a health questionnaire.

These regulations apply to all persons wishing to register for the Marathon du Mont-Blanc 2026, whether of French or foreign nationality.

It is the responsibility of each rider to complete and check the status of their registration on their rider space.

The PPS must be completed and uploaded to the rider's space by May 31, 2026 at the latest.

If the runner's registration file is not completed and validated by the deadline, he/she will not be able to collect his/her race number and will not be able to start the race.

Participants who so wish can take out "cancellation" insurance when registering for one of the Mont Blanc Marathon races, the conditions of which can be consulted via this link. This option must be taken out before registration is validated. This option allows the participant, under certain conditions established by the insurer, to be reimbursed for the registration fees paid.

If the rider has not taken out cancellation insurance at the time of registration, he/she will not be able to claim a refund from the organization.

Personal accident insurance

Each competitor must be in possession of personal accident insurance covering search and evacuation costs in France and Switzerland (90km). Helicopter evacuations in Switzerland are subject to a fee, as are evacuations in France by private helicopter. The choice of evacuation depends exclusively on the organization, which will always give priority to the safety of the runners.

Such insurance can be taken out with Assur-Connect by clicking here : Take out insurance

Our partner Assur Connect's insurance covers: medical repatriation on the basis of actual costs, medical expenses, helicopter evacuation costs and, for EU residents, death and disability benefits, as well as runners' personal liability. For further information contact@assur-connect.com or +33 01 85 73 31 15.

Personal liability

In accordance with current legislation, the organizer has taken out insurance covering the financial consequences of his civil liability, that of his employees and that of all participants in the Mont Blanc Marathon. As far as the civil liability of participants is concerned, this insurance is limited to accidents they may cause during the running of the Mont Blanc Marathon. This cover is in addition to, or in default of, any other insurance that participants may have. Proof of coverage may be provided to any participant on request.

Material damage

The organizer declines all responsibility in the event of damage (theft, breakage, loss, etc.) to participants' personal property, even if it is under the organizer's supervision. The participant, in his capacity as owner, expressly agrees to retain custody of his personal property during the event. This includes, in particular, any damage to the participant's personal belongings while they are left in the relief bags provided for runners by the organizer. Participants cannot claim against the organizer for any damage to their equipment. It is the responsibility of each participant to take out insurance to cover such risks.

90 km, 42 km, 23 km, and Duo Étoilé: Several options are available depending on your location and mode of transportation.

Please note that payment for the carbon offset related to your round-trip journey from home to Chamonix is mandatory, regardless of the type of race bib. You will therefore be required to upload proof of residence at the time of registration.

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I live in the Chamonix Valley* Community and I am coming by train, bus, on foot, or by bike: I can register without going through the lottery. 

10% of the race bibs are concerned.
Registration opens on Monday, October 20 at 10:00 AM. The number of bibs is limited—first come, first served.
*Communes of Servoz, Les Houches, Chamonix-Mont-Blanc, and Vallorcine

I am coming by train or bus: I can register without going through the lottery.

40% of the race bibs are concerned.
Registration opens on Wednesday, October 22 at 10:00 AM. The number of bibs is limited—first come, first served.

I am coming by another means of transport: I register through the lottery (free of charge).

50% of the race bibs are concerned.
Lottery registration is open from Thursday, October 23, 2025, at 10:00 AM until Thursday, October 30, 2025, at 12:00 PM.

It is only possible to register once for one of the four races subject to the lottery.

The lottery results will then be communicated by email to registered participants. Selected runners must complete their registration and pay for their race bib by Wednesday, November 5, 2025, at 2:00 PM.

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10 km, Vertical Kilometer, The Young Race, and Mini-Cross:

Registration without lottery until all spots are filled.
Registration opens on Thursday, November 6 at 10:00 AM.

Runners wishing to participate in the Mont-Blanc 10 km, the Vertical Kilometer, The Young Race, or the Mini-Cross can register without a lottery for one or more races, until all available spots are taken.

As with the races subject to the lottery, 40% of the bibs for the Mont-Blanc 10 km and the Vertical Kilometer will be reserved for runners committing to come by train or bus. Runners will therefore need to select their mode of transport to Chamonix at the time of registration.

• Mont-Blanc 10 km: 800 bibs reserved for Bus/Train, 1,200 bibs reserved for other means of transport.
• Vertical Kilometer: 280 bibs reserved for Bus/Train, 420 bibs reserved for other means of transport..

Conditions for accessing bibs reserved for train or bus:

• More than half of the journey (home–Chamonix) must be completed by train or bus.
• The train or bus ticket must cover a round trip including the date of the event.
• Runners choosing this option must upload their travel ticket to their runner account no later than May 4, 2026.
• For residents of the Chamonix Valley, the Viacham card will serve as proof of travel (replacing the train or bus ticket). It must be uploaded to the runner’s registration profile with a validity date covering the event period.
• Failure to upload the ticket or any proven fraud will result in registration being canceled without refund.

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Online Registration Only

Registration for the Mont-Blanc Marathon races is done exclusively online, with payment by credit card.
Please make sure to provide accurate personal information, especially your email address, which is essential for receiving confirmation and information messages from the organizers.
We recommend using your personal email address (not a work email) to avoid any issues with spam filters.

Final and Non-Refundable Registration

All registrations are final and non-refundable, regardless of the reason. Only runners who purchased cancellation insurance at the time of registration can request a refund from the insurer, according to the insurer’s terms and conditions. Refund requests must be made directly through the runner’s account.
Cancellation insurance cannot be purchased after registration; it must be selected during the race registration process.
Bank fees paid at the time of registration are never refunded.

Verification of Your Registration

If you have received the confirmation email and can access your runner account, your registration has been successfully recorded.
However, your file may still appear as “incomplete” until certain supporting documents (proof of residence, travel ticket, or PPS) have been validated by the organizers.

Duo Étoilé, 23 km, 42 km and 90 km du Mont-Blanc: Runners residing in the Communauté de Communes de la Vallée de Chamonix (Servoz, Les Houches, Chamonix-Mont-Blanc and Vallorcine) who commit to coming by public transport, on foot or by bike, benefit from direct registration without going through the draw.

Registration opens: Monday, October 20 at 10:00 a.m.

10% of race numbers are concerned:

• 90km: 100 race numbers

• 23km: 200 race numbers

• Star duo: 50 team numbers

• 42km: 230 race numbers

The number of race numbers is limited: first come, first served.

Conditions for "Chamonix Valley residents" race numbers:

• Your return journey (home-Chamonix) must be made by train, bus, foot or bike.

• You MUST upload the following to your profile when you register: Proof of address showing that you live in the Chamonix Valley community of communes (Servoz, les Houches, Chamonix-Mont-Blanc, Vallorcine).

• You must upload your ViaCham card (valid at the time of the event) to justify your train or bus journey.
• In the case of the Star Duo, both runners must live in the Chamonix Valley community (Servoz, les Houches, Chamonix-Mont-Blanc, Vallorcine) and upload their ViaCham cards. In the event of a rider being replaced on the team, the replacement rider must also reside in the Vallée de Chamonix community of communes and provide his or her ViaCham card.

• Checks will be carried out. In the event of non-delivery, proven fraud, or a ViaCham card that does not meet these criteria, registration will be cancelled without refund.

• Payment of carbon offsetting, linked to travel to Chamonix, is compulsory whatever your mode of transport (train, bus). The calculation takes into account the round-trip distance between your home and Chamonix, and the mode of transport used. The money raised is donated to theAssociation Française d'Agroforesterie.

• Group registrations are not available for this registration method. They are only possible via the draw.

Duo Étoilé, 23 km, 42 km and 90 km du Mont-Blanc: Runners who commit to coming by train or bus benefit from direct registration without going through the draw.

Registration opens: Wednesday, October 22 at 10:00 a.m.

40% of race numbers are available for this type of registration:

• 90km: 400 race numbers

• 23km: 800 race numbers

• Star duo: 200 team numbers

• 42km: 920 race numbers

The number of race numbers is limited, first come = first served.

Details:

• More than half of the journey (home-Chamonix) must be made by train or bus.
  The train or bus ticket must be for a return journey including the date of the event.
  
• Runners who choose to take part in this scheme will be required to upload their ticket to their runner account by May 4, 2026 at the latest.
  
• For residents of the Chamonix Valley, the ViaCham card will act as proof of transport (and will therefore replace the train or bus ticket). It must be uploaded to the runner's registration profile with a validity date covering the period of the event.
  
• In the case of the Star Duo, both riders must upload their tickets. In the event of a rider being replaced on the team, the replacement rider will also have to commit to coming by train or bus, and therefore provide a transport ticket corresponding to the criteria.
  
• Checks will be carried out. In the event of non-delivery, proven fraud, or a ticket that does not correspond to these criteria, registration will be cancelled without refund.
  
• Payment of the carbon offset linked to travel to Chamonix is compulsory , even in the case of train/bus numbers. The calculation takes into account the round-trip distance between your home and Chamonix, and the mode of transport used. Runners are therefore required to upload a proof of address when registering to prove their place of residence. The money raised will be donated to theAssociation Française d'Agroforesterie.
  
• Group registrations are not available for this registration method. They are only possible via the draw.

Duo Étoilé, 23 km, 42 km and 90 km du Mont-Blanc: I'm entered in the draw because I use a means of transport other than the train or bus to get to Chamonix.

For this type of race number, all modes of transport are accepted. However, we strongly encourage you to use low-carbon modes of transport (train, bus, bike, walking, carpooling...).

Registration for the draw opens (free of charge) on Thursday, October 23 at 10:00 a.m. and closes on Thursday, October 30, 2025 at 12:00 p.m.

50% of race numbers are available for this registration method:

90km: 500 race numbers
23km: 1000 race numbers
Duo étoilé: 250 team race numbers
42km: 1150 race numbers

Draw procedures:

• Runners wishing to take part in the draw must choose just one of the four races: 90km, 42km, 23km or Duo étoilé.
• It is forbidden to enter the draw more than once (on the same race or on different races). Any runner attempting to enter the draw more than once will have all his or her entries automatically cancelled and will therefore not be able to take part in the draw.
• Entries for the draw will be accepted from Thursday, October 23 at 10:00 am to Thursday, October 30 at 12:00 pm. If the number of pre-registrations for a race exceeds the maximum number of runners possible, the draw will be organized.
• The results of the draw will be communicated by email to those registered on November 5 from 2:00 pm. The selected runners will then have to finalize their registration and the payment of their race number before November 17 at 5:00 pm.
• Group registration: it is possible to pre-register as a group for the 90km, 42km or 23km Mont-Blanc, provided that the group is set up for the same race.
   

Registration procedures for runners selected in a draw:

1. Runners selected in the draw will be required to pay the carbon compensation for their travel to Chamonix. 
   To do so, they will need to upload proof of address when they register, whatever their mode of transport (train, bus, car, plane, foot...). The calculation takes into account the round-trip distance between your home and Chamonix, and the mode of transport used. The money raised is donated to theAssociation Française d'Agroforesterie.
2. Checks will be made on the accuracy of the carbon offset, and in case of doubt, the ticket corresponding to the mode of transport declared may be requested in order to verify your carbon offset declaration.

10km, Kilomètre Vertical, The Young Race and Mini-Cross: Runners can register for one or more races without drawing lots, while places last.

Registration opens: November 6 at 10:00 a.m.

As for the races subject to a draw, 40% of the race numbers for the Mont-Blanc 10km and KM Vertical are reserved for runners who commit to coming by train or bus. Runners must therefore choose the mode of transport they will use to get to Chamonix when they register.

• 10km du Mont-Blanc: 800 numbers reserved for bus/train and 1200 numbers reserved for other means of transport.
• Kilomètre Vertical: 280 number bibs reserved for Bus / Train and 420 number bibs reserved for other means of transport.
  The number of number bibs is limited, first come = first served.

Payment of the carbon offset linked to travel to Chamonix is compulsory (excluding The Young Race and Mini-Cross), whatever your mode of transport (train, bus, car, plane, etc.). You'll need to upload proof of address when you register, whatever your mode of transport. The calculation takes into account the round-trip distance between your home and Chamonix, and the mode of transport used. The money raised is donated to theAssociation Française d'Agroforesterie.

Checks will be made on the accuracy of the carbon offset, and in case of doubt, you may be asked to show the ticket corresponding to the mode of transport declared, in order to verify your carbon offset declaration.

Conditions for train and bus bibs:

• More than half of the journey (home-Chamonix) must be made by train or bus.
• The train or bus ticket must be for a return journey including the date of the event.
• Runners who choose to take part in this scheme will be required toupload their tickets to their runners' accounts by May 4, 2026 at the latest.
• For residents of the Chamonix Valley, the ViaCham card will act as proof of transport (and will therefore replace the train or bus ticket). It must be uploaded to the runner's registration profile with a validity date covering the period of the event.
• Checks will be carried out. In the event of non-downloading, proven fraud, or a ticket that does not correspond to these criteria, registration will be cancelled without refund.

The purchase of a solidarity or environmental bib is an opportunity for runners to guarantee their entry in one of the Mont Blanc Marathon races (without a draw for the 90 km, 42 km, 23 km and Duo Étoilé events), while contributing to a solidarity and impact project.

Registration opens: November 5 at 2:00 p.m.

More information

Payment of carbon offsetting for travel to Chamonix is compulsory, whatever your mode of transport (train, bus, car, plane...). You'll need to upload proof of address when you register, whatever your mode of transport. The calculation takes into account the round-trip distance between your home and Chamonix, and the mode of transport used. The money raised is donated to theAssociation Française d'Agroforesterie.

Checks will be made on the accuracy of the carbon offset, and in case of doubt, you may be asked to show the ticket corresponding to the mode of transport declared, in order to verify your carbon offset declaration.

Group pre-registration Group pre-registration is possible for the Mont-Blanc 90km, 42km or 23km, provided the group is formed for the same race.

• Group registrations must be made for the same race (minimum 2 people and maximum 10 people per group).
• Group registrations are only possible in the case of a random draw.
• If a group consists of more than 10 people, it will not be entered in the draw.
• If a runner has already registered individually, he/she cannot re-register as a group.

The only advantage of registering as a group is to have the same draw result for all group members, whether positive or negative. The probability of being drawn is the same for all runners, whether pre-registered individually or as a group.

1. Each group member must fill in the "group code" information on the registration form.
2. The code must be created by the 1st member of the group to register and then passed on to the other members of the group. It is then up to the group leader to know who makes up his or her group.

Be very careful when entering the group code, as in the event of a code error, group members will not be grouped together under the same group. We recommend that you do not use spaces or special characters in the group name, only capital letters and numbers. Example of a group code: MBM189 (this is an example, please do not use this code).

Specific conditions ViaCham card:
 

• In order to justify your train or bus journey, you must download your ViaCham card (valid on the date of the event) when you register. If your current subscription does not yet cover the event period, you can first download your current card, then add the new card (including the dates of the Mont Blanc Marathon) before May 4, 2026.
   
• It must include the following information: Last name, first name and validity date.
   
• To do this, open your ViaCham application and take two screenshots (like the example below):
  1. the " Pass " side (with your first and last name),
  2. the " Services " side (with the validity date).
   

• Only one document can be uploaded when you register. To merge your two screenshots (JPG or PDF) into a single file, you can use the free online tool: https://tools.pdf24.org/fr/
   

  

• Note: for Bib Chamonix Valley residents on foot or by bike only : downloading the ViaCham map is not compulsory. However, in the event of verification or doubt about your declaration, additional supporting documents may be requested.

Proof of address :

To validate your registration, proof of address is required if you have chosen a "train/bus" number or if you have chosen a "Chamonix valley resident" number. This document is also required to calculate and pay for carbon offsetting.

Accepted proofs of address:
- Avis d'imposition ou certificat de non-imposition
- Attestation ou facture d'assurance du logement
- Relevé de CAF mentionnant les aides liées au logement
- Facture d'électricité, de gaz, ou d'eau
- Facture de téléphone (y compris de téléphone mobile)
- Quittance de loyer

The document must include your full name, address and be dated less than one year.

> Special cases of proof of address for race numbers for Chamonix valley residents :

• If your child is staying with you free of charge, he/she must:
  Upload a certificate of accommodation from his/her parents who live in the Chamonix Valley, together with proof of address in the parents' names 
  +
  An employment contract covering the period of the event and concerning a job located in the Communauté de Communes de la Vallée de Chamonix 
  
  OR a certificate of school attendance 
  
  OR a Pôle emploi certificate
   
• If you are a seasonal worker and are housed by your employer, you must:
  Upload a certificate of accommodation, located in one of the communes of the Communauté de Communes, from your employer
  +
  An employment contract covering the period of the event and concerning a job located in one of the communes of the Communauté de Communes.

Race changes are only possible if there are still places available in the race concerned, and only to change :

• From 90km to KM Vertical or 10km.
• From 42km to KM Vertical or 10km.
• From 23km to KM Vertical or 10km.
• From Duo étoilé (for one member of the pairing in the event of injury to his/her partner) to KM Vertical or 10km.
• KM Vertical to 10km
• Young Race Marathon to 10km.
• From 10km to Young Race Marathon.

Any other change of race is not possible.

To do so, the runner must notify the organization in writing before April 30, 2026, so that we can make a new race number allocation. No refunds will be made.

For any request for a change of race, only the runner concerned may expressly make this request in writing (email or post). Requests made by a person other than the runner will not be valid.

Only one request for a change of team-mate in the Star Duo is possible, provided that this request is made before April 30, 2026.

To do so, the rider wishing to be replaced must send an email to the organization notifying his wish and including all information relating to the person who will replace him. Only one change per team is possible. No refunds will be given; riders must make their own arrangements. Following this change, we cannot guarantee that we will be able to supply a t-shirt corresponding to the size requested by the replacement rider.

Norider may be replaced within a team, for any reason whatsoever, after April 30, 2026.

• Any exchange of bib numbers between runners will result in immediate disqualification of the team and a 10-year ban on re-registration for Mont Blanc Marathon races.
• All registrations are personal, firm and final, and cannot be reimbursed for any reason whatsoever (except for those who have taken out cancellation insurance at the time of registration).
• Any person transferring their race number to a third party will be held responsible in the event of an accident occurring or caused by the third party during the event. The organization declines all responsibility in the event of such an accident.
• Any person holding a number acquired in breach of the present regulations will automatically disqualify the pair without reimbursement.
• Any runner caught in the act of reselling a race number will have his or her registration and that of his or her partner cancelled without refund, and will be barred from registering for Mont Blanc Marathon races for a period of 10 years.

Bib numbers must be fully legible during the race.

Numbers will be handed over by appointment only, at Place du Mont-Blanc in Chamonix. The runner must choose a time slot via the email sent by the organization in the month preceding the race. No bibs will be issued outside this time slot. Appointments must be made in your runner's area before 5:00 p.m. on June 19.
Your appointment confirmation for the race number pick-up will appear on your pick-up card, sent by e-mail and also downloadable from your runner's area. your runner's area.

At the time of number collection, runners must bring their race bag with them, including all the equipment required for timing chip fitting and equipment checks. Numbers will not be issued to runners who do not present their race bag and the compulsory equipment for the race in which they are entered.

Each race number will be given to the runner in person, on presentation of the race number collection card sent by e-mail on June 21 and also downloadable from your runner's spaceA photo ID. Without this document, the race number will not be issued. Runners must know their race number before picking it up.

Specific details of race number collection for each race:

• 90km du Mont-Blanc : No race numbers distributed on the Friday morning before the start of the race.
• KM Vertical : Numbers can be collected on Thursday and no later than one hour before the start of the race.
• 23km du Mont-Blanc: Special time slot on race morning for runners living within a 2-hour radius of Chamonix (by appointment).
• Mini Cross: Pick-up of race numbers on Thursday and Friday at Place du Mont-Blanc from 9:30am to 7:00pm, or on Saturday from 9:30am to 1:00pm at the "Vaincre les Maladies Lysosomales" stand, located near the EMC2 on the Trail Camp. No race numbers distributed after 1:00 pm on Saturday.
• 10km du Mont-Blanc: No race numbers distributed after 9:30 am on Saturday morning.
• Young Race Marathon: No race numbers distributed after 1:00 pm on Saturday.
• Duo étoilé: No race numbers distributed after 6:00 pm on Saturday.
• 42km du Mont-Blanc: Special time slot on race morning for runners living within a 2-hour radius of Chamonix (by appointment).

It is up to runners to check the number collection times for the race they are taking part in when they register, in order to plan their arrival in Chamonix according to their number collection slot.

For the 90km, 42km and 23km of Mont-Blanc, the starting SAS are set up according to the runner's UTMB index, approximately 1 month before the race. A runner with no UTMB index will be assigned to the last starting SAS. A runner whose UTMB index has changed between the time of the SAS assignment and race day will not be able to change SAS.

For the Mont-Blanc 10km, the start SASs will be assigned according to the time estimated by the runner to complete the race at the time of registration. The allocation of runners to the SAS will take place approximately one month before the date of the race.

No claims can be made to the organization regarding the allocation of SASs: by registering, runners agree to accept the SAS to which they will be allocated on race day. However, it will be possible to request a change to a higher SAS (e.g. from SAS 2 to SAS 3); this change will be made on site on race day.

The Mont Blanc Marathon races are run semi-autonomously. Semi-autonomy is defined as the ability to be self-sufficient between two refreshment points, in terms of food, clothing and safety equipment, enabling the runner to adapt to foreseeable or unforeseen problems (weather changes, physical problems, injuries, etc.).

It is up to runners to estimate their food and water requirements between two refreshment points. The quantity of water specified in the list of compulsory equipment is the minimum quantity required.

Composition of refreshment points

Two types of refreshment points are available:

During the race (slight differences depending on location or race):

• Food: Bread, tomme, sausage, sweet cakes, Tucs, oranges, bananas, apricots, peaches/nectarines, watermelon (if very hot), MX3 energy bars, MX3 broth. In addition, for the 90km only: röstis at the Emosson refreshment station from 11.30 a.m. to 2.30 p.m., pizzas at the Les Bois refreshment station from 6 p.m. to 10 p.m., pasta at the Montenvers refreshment station from 7 p.m. to 9 p.m.
• Drinks: Still water, sparkling water with MX3 electrolytes, sparkling water with mint syrup and Coca-Cola, tea (if bad weather), MX3 energy drink.

On arrival:

• Food: Hot dog diots (vegetarian variant possible), tomme, sweet cakes, oranges, apricots, nectarines/peaches, watermelon (if very hot).
• Drinks : Still water, sparkling water with mint syrup and Coca-Cola, tea (if bad weather), beer (except for Mini Cross and The Young Race).

Accompanying persons are not allowed in the refreshment area. Individual assistance of runners is only permitted 100 metres before or 100 metres after the refreshment posts. Outside these zones, it is forbidden, as is assistance during the race.

Any assistance provided outside the authorized zones will result in a time penalty being applied to the riders receiving the assistance.

It is strictly forbidden to start a race accompanied by a baby or child.

In the event of adverse weather conditions, and for safety reasons, the organization reserves the right to modify the time limits or to stop the event in progress. All decisions will be taken by the race jury.

Maximum race times and time limits take account of any delays (traffic jams, equipment checks, waiting at refreshment points, etc.).

Time limits are imperative and their application is non-negotiable. If a runner arrives after a time barrier has been applied, he or she is out of time and will be disqualified. The bottom right-hand corner of the runner's number will be cut off by the member of the organization in charge of the time barrier and the runner will be invited to return home by his own means or by the means set up by the organization.

If the runner wishes to continue the race despite his disqualification, his number will be recovered by the organization and the runner will no longer be considered a participant in the Mont Blanc Marathon; he will therefore no longer be under the responsibility of the organizer.

If you cross the finish line after the maximum race time, you will not be classified and therefore will not be considered as a finisher.

Anyone disrespecting the members of the organization responsible for enforcing the time limits will be banned from all Mont Blanc Marathon events.

In the case of a multi-wave start, time limits are applied from the start time of the last wave. The maximum race time is calculated according to each runner's start time.

90km Mont-Blanc

Maximum race time: 24 hours

• La Flègère (km 18)
• Le Buet feed station (km 27.7)
• La Villaz (km 38)
• Emosson feed station (km 43.3)
• Le Châtelard (km 47)
• Tour feed station (km 63)
• Les Bois feed station (km 73)
• Montenvers refreshment point (km 78.5)
• Plan de l'Aiguille refuge refreshment point (km 84.4)
  

42 km of Mont-Blanc

Maximum race time: 10 hours

• Tour refreshment point (km 13.5): Start time of last wave + 2h45 of race.
• Vallorcine refreshment point (km 23.5): Start time of last wave + 5.5 hrs race.
• La Flégère feed station (km 34.2): Start time for last wave + 8h30 race.
  

23km Mont-Blanc

Maximum race time: 6 hours

• Montroc feed station (km 11.4): Start time of last wave + 2h30 of race.
• La Flégère feed station (km 18.4): Start time for last wave + 4h30 race.
  

Star duo

Maximum race time: 6 hours 30 minutes.

• Chemin Caillet junction (km 4.5): start of last wave + 1h15 race.
• Montenvers refreshment point (km 7.6): start of last wave + 2h30 of race.
• Refuge du Plan de l'Aiguille feed station (km 13.7): start of last wave + 4h30 of race.
  

10km du Mont-Blanc,

Maximum race time: 2h30

No time limits.

The Young Race,

Maximum race time: 1h30 for the U18 course / 3h00 for the U20 course

Time barrier on the U20 course at 1600m (blaitière junction).

KM Vertical and Mini-Cross

No time limits or maximum times.

The list of equipment below complies with the specific trail rules published by the FFA. Each runner undertakes to possess the safety equipment stipulated in the present regulations throughout the event (before the start, during the race, in the finish area).

Checks may be carried out at any time during the event to ensure that the race runs smoothly. The runner is obliged to submit to these checks with cordiality; in the event of refusal to be checked, or in the event of non-compliance with the penalty applied, the runner will be disqualified.

Compulsory equipment must also be presented by the runner when collecting his race number. Failure to do so will result in the race number not being issued.

90km du Mont-Blanc

Compulsory equipment :

• Cell phone in working order, with a subscription that works in France and Switzerland.
• Minimum 1-liter water supply.
• Waterproof jacket with hood (gore-tex type) adapted to your size.
• Warm, long-sleeved second-layer garment, adapted to your size.
• Head or chest lamp with spare batteries.
• Survival blanket (140cm x 200cm).
• Whistle.
• Tumbler.
• Identification.
• Bowl and spoon.
• Cash.

Recommended equipment:

• Cap.
• Tights.
• Gloves.
• Roll of straps.

Poles are allowed on the Mont-Blanc 90km. If you choose to take poles, you must do so for the duration of the race. It is forbidden to start without poles and to pick them up along the way.

42km du Mont-Blanc, 23km du Mont-Blanc

Compulsory equipment :

• Cell phone in working order.
• Minimum 0.50-liter water supply.
• Waterproof jacket with hood (gore-tex type) adapted to your size.
• Whistle.
• Survival blanket (140cm x 200cm).
• Tumbler.
• Cash.

Recommended equipment depending on weather conditions:

• Hat.
• Tights.
• Gloves.
• Roll of straps.
• Bowl and spoon.

Poles are allowed on the 42km and 23km. If you choose to take poles, you must do so for the duration of the race. It is forbidden to start without poles and to pick them up along the way.

Star duo

Compulsory equipment (for each runner) :

• Cell phone in working order.
• Minimum 0.50-liter water supply.
• Waterproof jacket with hood (gore-tex type) adapted to size.
• Working headlamp or chest lamp with spare batteries.
• Survival blanket (140cm x 200cm).
• Whistle.
• Tumbler.

Recommended equipment:

• Hat.
• Tights.
• Gloves.
• Bowl and spoon.

Sticks are permitted on the Duo étoilé. If you choose to take poles, you must do so for the duration of the race. It is forbidden to start without poles and to pick them up along the way.

KM Vertical & 10km du Mont-Blanc

Compulsory equipment :

• Cell phone in working order.
• Minimum 0.50-liter water supply
• Tumbler.

Recommended equipment depending on weather conditions:

• Waterproof jacket (Gore-tex type).

Please note that poles are not allowed on these races.

The Young Race

Compulsory equipment:

• Cell phone in working order.
• Minimum 0.50-liter water supply
• Tumbler.
• Waterproof jacket with hood (gore-tex type) adapted to your size.
• Survival blanket (140cm x 200cm).
• Whistle.

Recommended equipment depending on weather conditions:

• Hat.
• Tights.
• Gloves.

Please note that poles are not allowed on these races.

A maximum race time is set for each event in the Mont Blanc Marathon. The maximum race time takes into account any delays on the course (traffic jams, equipment checks, waiting at refreshment points, etc.).

Runners crossing the finish line after the maximum race time will not be classified and will not be considered as finishers.

The maximum race time is calculated according to each runner's start time. In the case of a wave start, the maximum race time is calculated according to the start time of your wave. Time barriers are calculated according to the start time of the last wave.

Maximum time for each race:

• 90km du Mont-Blanc : 24h00
• 42km Mont-Blanc: 10h00
• 23km Mont-Blanc : 6h00
• Duo étoilé: 6h30
• The Young Race : U18 1h30 / U20 3h00
• 10km Mont-Blanc: 2h30
• KM Vertical: no time limit
• Mini-Cross: no time limit

In the event of withdrawal, the competitor must notify a member of the organization (refreshment station attendant, race closing officer, first-aid attendant, etc.), giving his or her race number. If there is no member of the organization near the runner who is retiring, the latter must contact race HQ to report his retirement. The Race HQ number is noted on the competitor's bib.

In the event of withdrawal, the lower right-hand corner of the race number will be cut off by the member of the organization and the runner will be invited to return home by his own means or by means set up by the organization. The runner will then no longer be considered a participant in the Mont Blanc Marathon, and will no longer be under the responsibility of the organizer.

Any person disrespecting the members of the organization responsible for collecting withdrawals will be permanently banned from all Mont Blanc Marathon events.

For the Duo Etoilé, if one of the two runners in the duo wishes to withdraw, his or her team-mate must also withdraw. It will not be possible to continue the race alone.

The race number must be visible throughout the entire race. It is forbidden to place the number on the backpack. The use of a number belt is permitted.

It is strictly forbidden to start a race with an animal, or to be accompanied by an animal during the race.

Accompanying animals are not allowed in the refreshment area. They must be kept on a leash in the vicinity of the refreshment posts, in the accompanying shuttles, or along the entire course that is not located in the Aiguilles Rouges Nature Reserve.

Dogs and other domestic animals are strictly forbidden on sections of the course that cross the Aiguilles Rouges Nature Reserve.

Permanent members of the organization, race marshals and checkpoint and refreshment post marshals are empowered to enforce compliance with the regulations (*).
They may immediately apply a penalty or disqualification measure in the event of non-compliance with the regulations, in accordance with the following table:

(*) Any other breach of the rules will be sanctioned by the race jury.

First-aid posts are set up at several points along the course. These posts are linked by radio or telephone to Race HQ and Emergency HQ. A medical team will be present throughout the event, and will be able to intervene on the course by any appropriate means, including by helicopter if necessary.

It is the responsibility of any runner in difficulty or seriously injured to call for help:

• By going to an aid station,
• By calling PC Secours (number noted on runners' bibs),
• By asking another runner or someone nearby to call for help.

It is the responsibility of each runner to provide assistance to any person in danger and to notify the emergency services. Any problem or accident must be reported immediately to the nearest control post.

Don't forget that hazards of all kinds, linked to the environment, weather conditions and the profile of the race, may mean that you have to wait longer than expected for help. Your safety will then depend on the quality of what you've packed in your bag.

A runner who calls on the services of a doctor or first-aider submits to their authority and agrees to accept their decisions. First-aid attendants and race doctors are empowered :

• Remove from the race any competitor physically unable to continue.
• Evacuate any runner they deem to be in danger by any means at their disposal.
• Hospitalize any runners whose state of health so requires.

Expenses arising from the use of exceptional means of rescue or evacuation will be borne by the person rescued, who must also ensure his or her return from the place where he or she was evacuated. It is the rider's sole responsibility to set up and submit a claim to his personal insurance company within the allotted time.

If you are unable to contact the rescue centre, you can call the emergency services directly (especially if you are in an "emergency only" zone): 112 from France.

An official race jury is appointed. The jury's power of decision is final, and it may be called upon to postpone or cancel one or more races, depending on weather conditions. The jury is made up of one member from each of the following organizations:

• First-aid center
• Chamoniarde
• Chamonix Sports Club
• CNEAS
• Croix Blanche
• Croix Rouge
• Dokever
• EMHM
• Chamonix Town Hall
• Vallorcine Town Hall
• Coordinating doctor

As the president of the jury is the race director, it is he who will make the final decision following consultation with the jury members.

In the event of excessively unfavorable weather conditions (large quantities of rain and snow at high altitudes, high risk of thunderstorms, etc.) and following the decision of the race jury, the organization has the right to modify start times, courses and race time limits. Runners will be notified of these changes by text and email. All information will also be posted on the event website and available at the information point located on the Place du Mont-Blanc during the event.

In the event of "force majeure": weather conditions (orange or red weather alert) preventing competitive running, natural disasters (earthquake, storm) or major political events (revolution, war, terrorist attacks) excluding pandemics, forcing the organizer to postpone the race, runners unable to take the start of the postponed race may request a refund of 60% of the registration fees actually received.
The following will not be reimbursed: donations to associations, cancellation insurance, subscriptions to RunMotion Coach, carbon offsetting and bank processing costs.

To benefit from this reimbursement, you must make a request on your registration profile before July 15, 2026. The refund will be made by crediting your credit card again within two months of your request.

Before the start of the race

In the event of "force majeure": weather conditions (orange or red weather alert) preventing competitive running, natural disasters (earthquake, storm) or major political events (revolution, war, attacks) excluding pandemics, forcing the organizer to cancel the event, 60% of the registration fees actually paid will be refunded.
The following will not be refunded: donations to associations, cancellation insurance, subscriptions to RunMotion Coach, carbon offsetting and bank processing costs. Refunds will be made by crediting your credit card.

During the races

In the event of "force majeure", the organizer may stop the race. In this case, runners arriving at a refreshment or control point must follow the instructions given by the volunteers, and are obliged to respect them. No refund can be claimed.

• For the 90km and 42km, prizes will be awarded to the first ten men and the first ten women overall, as well as to the first three men and the first three women in each age category represented in the race.
• For the 23km and 10km, prizes will be awarded to the first three men and the first three women overall, as well as to the first three men and the first three women in each age category represented in the race.
• For the KMV, prizes will be awarded to the first ten men and the first ten women overall.
• For the Duo étoilé, prizes will be awarded to the first three men's teams, the first three women's teams and the first three mixed teams.
• For The Young Race, the first three men and the first three women in the relevant categories will be rewarded.
• For the Mini Cross, the first boys and girls in each age category will be rewarded.

Prize Money

90km Mont-Blanc :

• 1st man / 1st woman
• 2nd man / 2nd woman
• 3rd man / 3rd woman

KM Vertical :

• 1st man / 1st woman
• Men's record time
• Women's record time

42km Mont-Blanc :

• 1st man / 1st woman
• 2nd man / 2nd woman
• 3rd man / 3rd woman

Each participant expressly authorizes the organizers of the Mont Blanc Marathon and their assignees, such as licensees, partners and the media, to use still or audiovisual images in which he or she may appear, taken during participation in the Mont Blanc Marathon races or at Trail Camp, in all media, including promotional and/or advertising documents, throughout the world and for the longest period provided for by law, regulations and treaties in force, including any extensions that may be made to this period.

In the case of a minor who has not signed a waiver, registration for the Mini-Cross implies parental consent to the use of the minor's images.

The Club des Sports de Chamonix organizes a sporting event called the "Marathon du Mont Blanc", which takes place on the last weekend of June each year. In application of the provisions of article L 333-1 of the French Sports Code, the Club des Sports de Chamonix is the exclusive owner of the right to exploit this event.

In this context, the Club des Sports de Chamonix is the sole owner of the image rights of each of the competitors taking part in the event, who have expressly waived their right to use these rights when registering.
Any communication about the event or use of images of the event must respect the name of the event, registered trademarks and the official agreement of the organization. Consequently, only the organization holds the right to use the riders' images, and may transfer this right.

Unless a license has been obtained from the Club des Sports de Chamonix, the capture and use of images is strictly forbidden. This means that the use of any racing image featuring riders is subject to a license issued solely by the Club des Sports de Chamonix.

In accordance with the French Data Protection Act of January 6, 1978, and the EU General Data Protection Regulation 2016/679, which came into force on May 25, 2018, each participant has the right to access and rectify personal data concerning him or her.

Pursuant to these provisions, the participant is entitled to object to the processing of his or her personal data, to request the rectification of his or her data, to object to the receipt of commercial prospecting, to request the deletion of his or her personal data, and finally to access his or her personal data. All these rights can be exercised by sending an e-mail to club@chamonixsport.com.

In general, the personal data communicated by participants is intended for the authorized personnel of the organizer.

Before and after the event, information relating to your sporting performance and/or your registration (in particular your results, photos and videos) are published on the Mont Blanc Marathon website. Your results in the draw and/or the races in which you have participated, together with your surname, first name and region, may be published by any media. If you wish to object to such publication for a legitimate reason, you must inform the organizer of this decision at club@chamonixsport.com, prior to the event and no later than thirty (30) days before the event, so that the appropriate measures can be taken.

Data is kept for a period of three (3) years from the end of the event. At the end of this retention period, the organizer will temporarily archive the data for the longest period of legal prescription applicable to this type of service. Access to them will then be strictly limited to use within a legal or judicial framework.

Purchase of leisure services or personalized products:

Leisure services" means the purchase of a race number. The participant does not benefit from a right of withdrawal on the purchase of leisure services that must be provided on a specific date or according to a specific frequency, in accordance with the following legal provisions of article L. 121-20-4 of the French Consumer Code:

"The provisions of articles L. 121-18, L. 121-19, L. 121-20 and L. 121-20-1 are not applicable to contracts whose object is :

[...] 2° The provision of accommodation, transport, catering or leisure services which must be provided on a specific date or at a specific time.
The provisions of articles L. 121-18 and L. 121-19 are, however, applicable to contracts concluded by electronic means when their object is the provision of the services mentioned in 2".

The same applies to personalized products such as engraved medals, pursuant to the provisions of article L. 221-28 of the French Consumer Code.

These regulations may be modified at any time and without prior notice by the organizing team of the "Marathon du Mont-Blanc" event, up until the day before the start of the first race. Any new version of the rules will be posted on the event website www.montblancmarathon.fr.