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 Time
THE LITTLE SWISS SISTER
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.
Dive deep into the heart of the race
Pre-registration is open
Log-in to your My UTMB runner account to check your eligibility and enter the lottery to participate in the OCC 2023. Don't miss your chance, pre-registration is open until December 31, 2022 at 23:59 CET.