OSJ ONTAKE50 MIDDLE 2026
A dirt-road race on normally closed forestry roads in the national forest below Mt. Ontake in Otaki, Nagano. The middle course runs out from Matsubara Sports Park to a turnaround on the Akadana spur road and back, climbing steadily to the midpoint and descending home.
The course tops out at 1,519 m (low point 892 m). The main climb comes right from the start: 624 m around 0–14 km. About 50% of the distance is gentle (under 5% grade). In 2025, 100% of starters finished. The median finish was about 3 h.
Predict your finish from your ITRA index
Enter your ITRA performance index to get your finish time, aid-station splits and cutoff margins from the results of 25 finishers of this race — the same model as the TRAIL STATUS app. Nothing is saved or sent.
The app adds predictions from your training log (Strava), race-day pacing and more. Free, no sign-up.
Predict in detail from my Strava trainingOverview
- Date
- Wed, 23 Sep 2026
- Start
- 07:30
- Location
- Nagano, Japan
- Distance
- 30 km
- Elevation gain
- 994 m
- Time limit
- 6h 30m
- ITRA
- H
- Official website
- www.outdoorsportsjapan.com/trail/ontake50/race-ontake50
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 15 km | Aid 1WS 赤棚支線（折り返し） | 15 km | — |
| F | 30 km | FinishFINISH 松原スポーツ公園 | 15 km | 14:006h 30m |
The small figure under each cutoff is the time from the start.
2025 results
52 starters, 52 finishers (100% finish rate). Finish times of those who finished:
- Fastest
- 2h
- Top 10%
- 2h 8m
- Top 25%
- 2h 37m
- Median
- 2h 54m
- Top 75%
- 3h 8m
- Top 90%
- 3h 26m
- Last finisher
- 4h 49m
"Top 25%" means one in four finishers had crossed the line by this time.
Years with a different course or different cutoffs are not directly comparable.
Practice courses
See the course on the Runnable map ↗
Runnable has practice courses on this race's trails, split into sections to run and sections to walk (pages in Japanese).
- Runnable practice course (29.3 km)
Other races
- Shinetsu Five Mountains 100mile 2026Mon, 21 Sep 2026 · Nagano, Japan · 163 km
- Shinetsu Five Mountains 110km 2026Tue, 22 Sep 2026 · Nagano, Japan · 112 km
- OSJ KOUMI 100 2026Sun, 11 Oct 2026 · Nagano, Japan · 165 km
- NOZAWA 65 km 2026Sun, 19 Jul 2026 · Nagano, Japan · 65 km
- OKUSHINANO 100 100km 2026Sat, 6 Jun 2026 · Nagano, Japan · 100 km
- OSJ ONTAKE100 100K 2026Sun, 19 Jul 2026 · Nagano, Japan · 107 km
From your training log, TRAIL STATUS estimates your finish time, aid-station splits and cutoff margins for this race.
Predict my raceCompiled from each race's official information. Details can change, so always check the race's official website for the latest. Spotted a mistake? Please tell us through the contact form.
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