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.