Registrations 2026

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.

............................................................................................................................

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.

............................................................................................................................

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.

............................................................................................................................

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).

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