Orsières-Champex-Chamonix (OCC)

Race completed

57 km Distance

3,500 m Climbing

8.1 Grit · Hardcore

46.0290° N, 7.1444° E© OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 61 m / km Mountain. Significant climbing. Steep sections will require power hiking.

Time limit 14 hours 14:44 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 77% of 50K races. Measured against 1007 races of the same distance. Cut-off calculator →

Field size ~1,417 Very large. Congested start, busy aid stations.

DUV results for the 2025 edition (57km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, August

Daytime high 18°C

Night low 8°C

Rainfall Showers likely

Daylight 13 h 37 m of light

Regional 2001-2020 average for August — NASA POWER, grid elevation 1714 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a mountain course. Poles are highly recommended for the sustained climbs.

By UltraHub Expert

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

Gear for this race

Chosen for 57 km of trail with 3,500 m of ascent.

Trail Running Shoes61 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition57 km of self-supported fuelling between aid stations.
Hydration VestsPole attachment and chest-strap stability on steep ground.
Trekking Poles3,500 m of ascent to walk up.
HeadlampsA 14 h limit puts you out there after dark.

Salomon

Sense Ride 5

RunRepeat found the Salomon Sense Ride 5 to have immaculate lockdown and a smooth and stable ride, making it confident on moderate trails and steep downhills. I…

★★★★★ 4.5

Brooks

Catamount 3

RunRepeat found the Brooks Catamount 3 to have a cozier upper that enhances the overall fit, though breathability and durability could be better. iRunFar noted…

★★★★★ 4.5

Skratch Labs