Registrations 2025

Save the date!

As announced in the spring, the environmental impact analysis carried out by the Aircoop agency in 2023 revealed that 96% of the Mont Blanc Marathon's carbon footprint is linked to the transport of participants and their companions. This year, in order to reduce this figure, 40% of race numbers will be allocated to participants coming by train, and carbon offsetting of participants' journeys (home/Chamonix) will be mandatory. All the information and procedures relating to these new features will soon be available online.

In the meantime, don't miss the two registration phases:

Duo Etoilé, 23km, 42km and 90km : races subject to draw

Runners wishing to take part in the Duo Etoilé, the 90km, the 42km, or the 23km du Mont-Blanc must first register for a draw (free of charge) , which will run from Thursday, October 24, 2024 at 9:00 a.m. until Tuesday, November 12, 2024 at 12:00 p.m.

It is only possible to register for one of the 4 races entered in the draw, either as a group or as an individual (group registration does not improve chances of being drawn). The results of the draw will then be communicated by email to all registrants on Monday, November 18, 2024. The selected runners will then have to finalize their registration and the payment of their race number before Friday November 29, 2024 at 12:00 pm. A specific procedure will be sent to them by email.

Group registration: It is possible to pre-register as a group for the 90km, 42km or 23km Mont-Blanc.

• Group registrations must be for the same race (minimum 2 people and maximum 10 people per group).
• In the case of the draw for race numbers reserved for runners who commit to coming by train, all group members must choose the train mode of transport (for example, it is not possible to have a group made up of 2 people who commit to coming by train and 2 people who choose another mode of transport such as the car).

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 riders. Each group member must fill in the "group code" information on the registration form. 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.

Please be careful when entering the group code: in the event of a code error, group members will not be grouped together under the same group. We recommend that you do not enter spaces or special characters.

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10km, Kilomètre Vertical, Young Race Marathon and Mini-Cross : Entries without a draw while places last.

Runners wishing to take part in the 10km du Mont-Blanc, Kilomètre Vertical, Young Race Marathon or Mini-Cross can register without a draw for one or more races, while places last. Registration opens on Wednesday November 20 at 9:00 am.

Registration for the Mont Blanc Marathon races is online only, with payment by credit card.

Choosing your race

The Mont Blanc Marathon races take place in the mountains, on technical courses that can have a significant vertical drop. To take part in these races, it is recommended that you have good experience of mountain running, are comfortable on all types of terrain and can run independently for several hours.

We also remind you that it is generally considered that 100m of positive ascent corresponds to 1km of additional running. For example: the 42km Mont-Blanc race has a positive altitude difference of 2540m, which corresponds to a distance of 42km + 25km, i.e. 67km. We therefore insist on the importance of taking the altitude difference into account before choosing your race.

Race	Distance	Ascent +/-	Distance felt	Time max	Nb barrier time	UTMB index recommended	Nb of registrants	% of finishers in 2024	Specifications
Image	92km	6330m +/-	155km	25h	9	450	1000 runners	60%	Highly technical race, aerial trails at altitude, steep +/- gradients, snow on some sections.
Image	42km	2540m +/-	67km	10h	3	350	2300 runners	95%	1st part rolling, 2nd part with very technical trails and steep +/- gradients
Image	23km	1680m+ / 870m-	39km	6h	2	270	2000 runners	94%	Short race on technical trails, accessible to intermediate runners.
Image	21km	1450m +/-	35km	6h30	3	240	500 teams / 1000 runners	97%	Night race in pairs, steep mountain sections.
Image	15km	1200m +	27km	-	0	0	150 runners	98%	Race for Espoirs and Juniors categories, end of the 42km course.
Image	10km	325m +/-	13km	2h30	0	160	1000 runners	100%	Race open to all, low-tech terrain and few gradients.
Image	3.8km	1000m +/-	13.8km	-	0	-	700 runners	100%	Aerial race (handrails, steps, etc.), very steep gradient, not recommended for people with vertigo.