OCC
OCC covers 60 km from Orsieres to Chamonix, delivering a sharp UTMB week mountain race with 3,500 meters of climbing and a fast 50K-final field.
OCC quick facts
- 50K final race in the UTMB World Series Finals.
- Point-to-point route from Orsieres to Chamonix.
- 60 km course with about 3,500 meters of climbing.
- Ultra-distance entry in Marathon Scout; not a 26.2-mile Boston qualifier.
What is the OCC?
OCC is the Orsieres-Champex-Chamonix race in the UTMB Mont-Blanc week. It serves as the 50K final and brings a fast, technical mountain format to the same international stage as the longer UTMB races.
OCC course route
The course starts in Orsieres and finishes in Chamonix after 60 km of alpine trail. The race lists 3,500 meters of climbing and a 14 hour 30 minute cutoff, making it short by UTMB-week standards but still demanding.
Weather for the OCC
Late August in the Valais and Mont-Blanc valleys can be mild, wet, or sharply colder at exposed points. The shorter distance favors speed, but weather and descent damage still matter.
Past OCC dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Thursday, August 27, 2026 | — | — |
OCC FAQ
When is the OCC?
The 2026 OCC is on Thursday, August 27, 2026.
How do I register for the OCC?
You can register for the OCC at montblanc.utmb.world.
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