OSJ ONTAKE100 100mile 2026
Also known as: OSJ ONTAKE 100 Miles
Run on unpaved forestry roads in the national forest at the foot of Mt. Ontake in Otaki, Nagano, normally closed to the public. Starting at night from Matsubara Sports Park, runners do two laps of Stage 1 on the Agematsu side, then Stage 2 toward Takigoshi. Entry requires a qualifying finish in the event's 100K.
The course tops out at 1,687 m (low point 876 m). There are 3 big climbs: 611 m around 24–35 km; 607 m around 79–90 km; 556 m around 110–133 km. About 50% of the distance is gentle (under 5% grade). In 2026, 42% of starters finished — a tough one. The median finish was about 22 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 60 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
- Sat, 18 Jul 2026
- Start
- 20:00
- Location
- Nagano, Japan
- Distance
- 163 km
- Elevation gain
- 5,729 m
- Time limit
- 24h
- ITRA
- 100M
- Official website
- www.outdoorsportsjapan.com/trail/ontake100/race-ontake100
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 25 km | Aid 1A1 白川小川（ステージ1 1周目） | 25 km | — |
| 2 | 54 km | Aid 2CP1 松原スポーツ公園（会場・デポ） | 29 km | Day 2 04:308h 30m |
| 3 | 80 km | Aid 3A2 白川小川（ステージ1 2周目） | 26 km | — |
| 4 | 110 km | Aid 4CP2 松原スポーツ公園（会場・デポ） | 30 km | Day 2 12:0016h |
| 5 | 130 km | Aid 5WS 濁川保安林管理道分岐（水） | 20 km | — |
| 6 | 139 km | Aid 6CP3 水交園 | 9 km | Day 2 16:0020h |
| 7 | 147 km | Aid 7WS 赤棚支線林道入口（水） | 8 km | — |
| F | 163 km | Finish松原スポーツ公園（FINISH） | 16 km | Day 2 20:0024h |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
2026 results
206 starters, 86 finishers (41.7% finish rate). Finish times of those who finished:
- Fastest
- 16h 48m
- Top 10%
- 19h 57m
- Top 25%
- 21h 11m
- Median
- 22h 28m
- Top 75%
- 23h 11m
- Top 90%
- 23h 28m
- Last finisher
- 23h 52m
"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 100mile (158.3 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.
TRAIL STATUS · FAQ · Privacy policy