OSJ ONTAKE100 100K 2026
Also known as: ONTAKE 100K
A midnight-start race on unpaved forest roads in the national forest at the foot of Mt. Ontake, roads normally closed to the public. It starts and finishes at Matsubara Sports Park in Otaki, passing back through the venue partway before heading out onto the forest roads again.
The course tops out at 1,687 m (low point 876 m). There are 4 big climbs: 348 m around 0–12 km; 611 m around 24–34 km; 557 m around 54–77 km; 499 m around 83–93 km. About 50% of the distance is gentle (under 5% grade). In 2026, 67% of starters finished. The median finish was about 17 h, through one night.
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 57 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
- Sun, 19 Jul 2026
- Start
- 00:00
- Location
- Nagano, Japan
- Distance
- 107 km
- Elevation gain
- 3,400 m
- Time limit
- 20h
- ITRA
- 100K
- Official website
- www.outdoorsportsjapan.com/trail/ontake100/race-ontake100
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 27 km | Aid 1A1 白川小川 | 27 km | — |
| 2 | 54 km | Aid 2CP1 松原スポーツ公園（ドロップバッグ） | 27 km | Day 1 10:0010h |
| 3 | 71 km | Aid 3W1 濁川保安林管理道分岐 | 17 km | — |
| 4 | 83 km | Aid 4CP2 水交園 | 12 km | Day 1 15:0015h |
| 5 | 90 km | Aid 5W2 赤棚支線林道入口 | 7 km | — |
| F | 107 km | FinishFINISH 松原スポーツ公園 | 17 km | Day 1 20:0020h |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
2026 results
1,016 starters, 683 finishers (67.2% finish rate). Finish times of those who finished:
- Fastest
- 8h 55m
- Top 10%
- 13h 14m
- Top 25%
- 14h 53m
- Median
- 16h 38m
- Top 75%
- 18h 21m
- Top 90%
- 19h 17m
- Last finisher
- 19h 56m
"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).
- OSJ ONTAKE100 100K (104.9 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
- SHIGAKOGEN 100 100km 2026Sat, 29 Aug 2026 · Nagano, Japan · 100 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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