Nagano, Japan · Wednesday, September 23, 2026

Fixed Distance 50K

OSJ Ontake 50km

20 days to go

54 km Distance

not publishedn/a Climbing

2.7 est Grit · Entry level

Calculated from 54 km alone — the organiser has not published an elevation profile. Read 2.7 as a floor, not a verdict.

36.6500° N, 138.1833° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~202 Large. Rarely out of sight of another runner.

DUV results for the 2025 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, September

Daytime high 23°C

Night low 13°C

Rainfall Showers likely

Daylight 12 h 10 m of light

Regional 2001-2020 average for September — NASA POWER, grid elevation 875 m. Not a forecast.

The Aid Station

Course-specific beta from the community

👟 gear

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

By UltraHub Expert

Gear for this race

Chosen for 54 km of trail.

Trail Running Shoes 54 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 54 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 54 km, without the bounce.
GPS Watches Battery life first — a 54 km day outlasts most full-GPS modes.