June 2021





Difference in height

m +

m -

ITRA Points

ITRA points



Created in 1979, the Cross du Mont-Blanc will celebrate its 42nd edition in 2020.

This friendly race, whose route has remained almost unchanged since its creation will take you on the track of the pioneers of the discipline. All in the middle of a panorama of dazzling beauty.

To participate to this race, it’s recommended to have a good mountain race experience, to be comfortable in any ground and to be autonomous for several hours. We draw your attention to the fact that a runner with no ITRA cotation higher than 270 points (check your odds) has very little chance to finish the race. In that case, it’s more recommended to participate in another race of Mont-Blanc Marathon.

Before to register, we strongly recommend that you read the route, profile and estimated passage times to be fully aware of the difficulty of this race. The barriers times indicated take into account possible slowdowns that you may encounter and we strongly advise you to plan your race with a margin over barriers time.

Date: 26th June 2021
Start: 08:00 am
Distance: 23 km
Distance of heights : 1680m+ / 870m-
ITRA Points : 1
(references : ITRA)

Short Trail in semi-autonomy
Open to ‘Espoirs’ category and upwards
2 000 maximum runners
Maximum time : 6 hours
2  full refreshments

After a departure from the paragliding area, the course gradually goes up the Chamonix valley passing successively by the hamlets of Bois and Lavancher to reach Argentière (1250m).

Runners bypass Argentière to join the Planet by the path of the rambles. Then, direction Montroc taking the municipal road and then take the trails to join the hamlet of Tré le Champ, a pretty village situated just before the mountain pass, and continue through the south balcony towards the Flégère.

After a crossing to the magnificent Combe de la Charlanon (1812m), the race continues with a very nice open balcony trail on the Mont Blanc Massif, which will lead runners to the end of the race.

The organisation draws the attention of the runners to the fact that, according to the systems and the settings used, the gpx tracks will be able to give very different results (from 1485m to 1981m of elevation gain for the 23 km).

ITRA recalls on its website the precise certification methods it uses. Click here to consult them 

Before you register, we strongly recommend that you read the course, profile and table of estimated lap times in order to fully understand the difficulty of this race. The time barriers indicated take into account possible slowdowns that you may encounter and we strongly advise you to plan your race with a margin over time restrictions.

Race Bibs Distribution at Place du Mont-Blanc :

  • Thursday 25 of June From 9:Am to 10:Pm
  • Friday 26 of June from 9:Am to 10:Pm

During the delivery of the bibs of the Mont-Blanc 23 km, runners will have to present their race bag including all the mandatory equipment for equipment control. Thanks to this, the organisation will be allowed to put a chronometric chip on them. No bib will be given to runners who don’t have their bag including all mandatory equipment.

  • Mobile phone. 
  • A reserve of at least 0,50 litre of water.
  • Waterproof and windproof jacket with hood (gore tex type) adapted to your size.
  • Survival blanket (140cm x 200cm).
  • Whistle.
  • Personal cup.

The time restrictions indicated below are given as an indication, they may be modified if necessary for the safety of the participants. In case of bad weather, and for security reasons, the organisation keeps the right to stop the event in progress or to change the time barriers. Any decision will be taken by the trail committee.

The arrival of a runner on a time bar outside the deadline implies his disqualification. The lower right corner of the bib will be “cut” by the postmaster and the runner will be invited to use public transport to return to Chamonix. If the runner wishes to continue the race, his bib number will be recovered by the postmaster and the runner will no longer be considered as a participant in the Mont-Blanc 23 km, so he will no longer be under the responsibility of the organiser.

Anyone who doesn’t respect the volunteers in charge of this function will be banned from racing permanently on all events of the Mont Blanc Marathon.

  • Refreshment of Tré le Champ (km 12): starting time of the last wave + 02h30.
  • Refreshment of La Flagère (km 18): starting time of the last wave + 04h30.
In the case of a starting time with waves the time barriers are calculated according to the starting time of the last wave.


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 Marathon Clips 

Réalisation : Coax – 2021.