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runner on the occ utmb mont blanc mountain trail


The ultimate challenge for mid-distance ultra-runners, the OCC is the 50K category final for the UTMB World Series.

Race Category



55 KM

Elevation Gain

3400 M+

Start Date

Thursday 29th August 2024

Race Start

Orsières - 08:15

Max Allowed Race Time

14 Hours 30 Minutes


The ultimate challenge for middle-distance runners, the OCC will start on a 55km course with 3,425 meters of positive elevation gain from Orsières, located in the south-western part of the canton of Valais in the Val d'Entremont.

This Swiss valley will amaze you with its unique landscapes: The OCC route will take you to the heart of this particular and typical nature before reaching Champex-Lac and Trient. You will then cross the Franco-Swiss border by the emblematic Balme pass and its sublime panorama on the Mont-Blanc massif. Once you have reached the last difficulty of the course and the ascent to La Flégère, you will only have to enjoy the descent and savor your performance by crossing the mythical finish arch in the center of Chamonix under the cheers of families and spectators.


A closer look at the course

All you need to know to participate in the OCC

All the information you need to know before starting an extraordinary adventure.

Repatriation insurance

Each competitor must have a personal accident insurance covering search and rescue costs in France and Switzerland.

Mandatory equipment

Check the list of mandatory equipment and the heatwave or extreme cold kits that can be activated depending on the weather conditions.

Dive deep into the heart of the race

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