OCC is a 57.0 km trail race of HOKA UTMB Mont-Blanc 2025 in Chamonix, France. The race starts on August 31, 2025. The course climbs 3500 m+ and descends 3143 m−, between a low point of 498 m and a high point of 2212 m. By gradient, 41% of the distance is uphill, 40% downhill and 20% flat. The longest climb runs 7.4 km at an average 14.0% grade (1033 m of vertical). The longest descent runs 5.4 km at 14.2% (760 m of vertical). Surface: 58% trail, 25% road, 11% smooth, and 7% technical. Flat-equivalent effort: 82.0 FlatKM.
1,417 finishers completed the 2025 edition. Men's winner: Jim Walmsley (United States) in 5:00:35. Women's winner: Miao Yao (China) in 5:35:13.
This page has the full results and splits, interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for OCC.
Other distances of HOKA UTMB Mont-Blanc 2025UTMB (176 km)·TDS (153 km)·CCC (101 km)·MCC (40.0 km)·ETC (15.0 km)·YCC (15.0 km)
Other editions of OCC2026
Official websitemontblanc.utmb.world
