31st August 2023
The ultimate challenge for mid-distance ultra-runners, the OCC is the 50K category final for the UTMB World Series.
Max Allowed Race Time
14 Hours 30 Minutes
THE NAMES HAVE BEEN DRAWN
Lottery results for the OCC have been announced. Check your email inbox or head to your My UTMB account.
THE LITTLE SWISS SISTER
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.
50K Final of the UTMB World Series
In 2023, the OCC becomes the annual 50K category final of the UTMB World Series, the ultimate challenge for all mid-distance ultra runners. Access to the OCC is open to all runners with at least one Running Stone and to elites who have qualified directly via the UTMB World Series races.
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.
Rules and Regulations
Check out the official OCC rules and regulations including registration process and fees, mandatory equipment, assistance policy, runner commitment and much more.
To participate in the OCC, you must have a valid UTMB Index in the 20K, 50K, 100K or 100M categories and at least 1 Running Stone.
Each competitor must have a personal accident insurance covering search and rescue costs in France and Switzerland.
Check the list of mandatory equipment and the heatwave or extreme cold kits that can be activated depending on the weather conditions.
Each competitor must upload the medical certificate on their dashboard before May the 31st 2023.