Okumusashi Long Trail 35 km 2026
A loop from Hanno Central Park over Mt. Tonomine, Mt. Tenkaku and Mt. Otaka, down to Agano, then back via Kaburi Pass, Yugate and Mt. Atago. It follows part of the Okumusashi Long Trail through low but relentlessly rolling hills.
The course tops out at 521 m (low point 107 m). There are 2 big climbs: 344 m around 4–12 km; 351 m around 15–19 km. Only about 30% is gentle (under 5% grade); most of it is climbing or descending. In 2026, 84% of starters finished. The median finish was about 8 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 71 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, 31 May 2026
- Start
- 08:00
- Location
- Saitama, Japan
- Distance
- 35 km
- Elevation gain
- 2,200 m
- Time limit
- 10h
- ITRA
- M
- Official website
- okumusashi105k-race.com/race-info
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 9 km | Aid 1WA1 東峠（水） | 9 km | — |
| 2 | 15 km | Aid 2A7 法光寺（吾野駅） | 6 km | Day 1 12:304h 30m |
| 3 | 19 km | Aid 3WA2 阿寺諏訪神社（水） | 4 km | — |
| 4 | 28 km | Aid 4A6 長念寺 | 9 km | Day 1 16:308h 30m |
| F | 35 km | FinishFINISH 飯能中央公園 | 7 km | Day 1 18:0010h |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
2026 results
1,303 starters, 1,090 finishers (83.7% finish rate). Finish times of those who finished:
- Fastest
- 4h 19m
- Top 10%
- 5h 57m
- Top 25%
- 6h 56m
- Median
- 7h 53m
- Top 75%
- 8h 50m
- Top 90%
- 9h 30m
- Last finisher
- 9h 59m
"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 (35.3 km)
Other races
- FunTrails Round Chichibu 100MILE 2026Sat, 14 Nov 2026 · Saitama, Japan · 160 km
- FunTrails Round Chichibu 100K 2026Sat, 14 Nov 2026 · Saitama, Japan · 105 km
- Okumusashi Long Trail 105 km 2026Sat, 30 May 2026 · Saitama, Japan · 105 km
- Trainic World 162.8 km 2026Sat, 16 May 2026 · Saitama, Japan · 162.8 km
- Trainic World 108.2 km 2026Sat, 16 May 2026 · Saitama, Japan · 108.2 km
- Kitamusashi GIANT'S GATE 2026Sat, 18 Apr 2026 · Saitama, Japan · 85.8 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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