Oze Tokura Mountain Marathon 21 km 2026
Also known as: MAMMUT KATASHINA MOUNTAINS SERIES
An out-and-back course from the Oze Tokura ski area in Katashina, Gunma, climbing via Fujimishita and Tashirohara to Fujimi Pass and turning at Fujimi Tashiro. It runs mostly on forest roads, and about 500 m of boardwalk near the turnaround must be walked. There are two aid stations, A1 and A2.
900 m of climbing over 21 km (43 m per km). The median finish was about 2 h.
Estimate your finish from your ITRA index
Estimate (no finisher data for this race)
Enter your ITRA performance index to get an estimated finish time, aid-station splits and cutoff margins. This race has no finisher ITRA data, so it uses the transfer model: your predictions for the 205 races that do have finisher data, scaled by distance and elevation gain (km-effort) — the same calculation 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, 25 Oct 2026
- Start
- 09:30
- Location
- Gunma, Japan
- Distance
- 21 km
- Elevation gain
- 900 m
- Time limit
- 5h
- ITRA
- H
- Official website
- oze-nationalpark-marathon.com/about
Elevation profile
No elevation data yet.
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| F | 21 km | FinishFINISH（尾瀬戸倉スキー場） | 21 km | Day 1 14:305h |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
Registration
- Registration
- Sat, 25 Jul 2026 – Wed, 14 Oct 2026
- Entry
- First come, first served
Add the race in the app to put registration opening and closing and the lottery results into your calendar.
2025 results
109 finishers. Finish times of those who finished:
- Fastest
- 1h 22m
- Top 10%
- 1h 48m
- Top 25%
- 2h 4m
- Median
- 2h 18m
- Top 75%
- 2h 43m
- Top 90%
- 3h 2m
- Last finisher
- 3h 20m
"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
- Joshu Hotakasan Skyview Trail 138km 2026Sat, 12 Sep 2026 · Gunma, Japan · 138 km
- Joshu Hotakasan Skyview Trail 77km 2026Sat, 12 Sep 2026 · Gunma, Japan · 77.5 km
- Oze Tokura Mountain Marathon 10 km 2026Sun, 25 Oct 2026 · Gunma, Japan · 10 km
- KAGA SPA TRAIL ENDURANCE 100 by UTMB KAGASPA 20K 2026Sat, 20 Jun 2026 · Ishikawa, Japan · 20.7 km
- KAGA SPA TRAIL ENDURANCE 100 by UTMB KAGASPA 20K 2027Sat, 19 Jun 2027 · Ishikawa, Japan · 20.7 km
- SHIGA KOGEN 100 18km 2026Sat, 29 Aug 2026 · Nagano, Japan · 18 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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