Okumusashi Long Trail Race 20K 2027
Also known as: OLTR 20K
A loop from Hanno Central Park via Mt. Tonomine, Higashi Pass and the Noguchi forest road down to Higashi-Agano, returning over Chonenji temple and Mt. Kamado. The 'Challenge' category was created as a first step toward the 35K and 105K.
The course tops out at 339 m (low point 113 m). About 40% of the distance is gentle (under 5% grade). In 2026, 96% of starters finished. The median finish was about 4 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 58 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, 29 May 2027
- Start
- 10:00
- Location
- Saitama, Japan
- Distance
- 20 km
- Elevation gain
- 1,000 m
- Time limit
- 6h
- ITRA
- H · 1 points
- Official website
- okumusashi105k-race.com/race-info
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 13 km | Aid 1A6 長念寺 | 13 km | 14:004h |
| F | 20 km | FinishFINISH 飯能中央公園 | 7 km | 16:006h |
The small figure under each cutoff is the time from the start.
2026 results
521 starters, 499 finishers (95.8% finish rate). Finish times of those who finished:
- Fastest
- 2h 6m
- Top 10%
- 2h 56m
- Top 25%
- 3h 21m
- Median
- 3h 51m
- Top 75%
- 4h 27m
- Top 90%
- 5h
- Last finisher
- 5h 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.
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
- Okumusashi Long Trail 105 km 2027Sat, 29 May 2027 · Saitama, Japan · 105 km
- Okumusashi Long Trail 35 km 2026Sun, 31 May 2026 · Saitama, Japan · 35 km
- Okumusashi Long Trail 35 km 2027Sun, 30 May 2027 · Saitama, Japan · 35 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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