Nagi Peaks Tough Trail Challenge 66 km 2026
A mountain race in the Nagi range on the Okayama–Tottori border. It leaves Shoboku Sports Park in Tsuyama before dawn, crosses the ridge via Kogenotawa down to Chizu in Tottori, then returns past Jabuchi Falls and back over Kogenotawa. The exposed ridge can be far colder than the valleys and the weather changes quickly.
The course tops out at 1,251 m (low point 142 m). 6 climbs of 400 m or more keep coming; the biggest is 634 m around 43–47 km. The longest descent drops 876 m around 20 km at about 13% on average. Only about 20% is gentle (under 5% grade); most of it is climbing or descending. The median finish was about 15 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, 7 Jun 2026
- Start
- 04:00
- Location
- Okayama, Japan
- Distance
- 66 km
- Elevation gain
- 5,100 m
- Time limit
- 16h 30m
- ITRA
- 50M
- Official website
- nagipeaks.com/race-information.html
Elevation profile
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| 1 | 26 km | Aid 1山の駅 | 26 km | Day 1 10:306h 30m |
| 2 | 36 km | Aid 2智頭 | 10 km | Day 1 13:309h 30m |
| 3 | 54 km | Aid 3声ヶ乢（復路） | 18 km | Day 1 18:3014h 30m |
| 4 | 60 km | Aid 4清泉公民館 | 6 km | Day 1 19:4515h 45m |
| F | 66 km | FINISH | 6 km | Day 1 20:3016h 30m |
The small figure under each cutoff is the time from the start. Day 1 is the day of the start.
2025 results
88 finishers. Finish times of those who finished:
- Fastest
- 10h 31m
- Top 10%
- 12h 37m
- Top 25%
- 13h 45m
- Median
- 14h 42m
- Top 75%
- 15h 45m
- Top 90%
- 16h 15m
- Last finisher
- 16h 28m
"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 (66.7 km)
Other races
- Nagi Peaks Middle 33 km 2026Sun, 7 Jun 2026 · Okayama, Japan · 33 km
- ONAGAWA 100 TRAILS 70km 2026Sat, 7 Mar 2026 · Miyagi, Japan · 70.4 km
- NOZAWA 65 km 2026Sun, 19 Jul 2026 · Nagano, Japan · 65 km
- Mt.FUJI 100 KAI70k 2026Sat, 25 Apr 2026 · Yamanashi, Japan · 68.6 km
- Mt.FUJI 100 KAI70k 2027Sat, 24 Apr 2027 · Yamanashi, Japan · 67.9 km
- Tokyo Grand Trail 60km 2026Sat, 23 May 2026 · Tokyo, Japan · 59 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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