Karuizawa Trail Running Race 2026
The ~43 km course (about 2,700 m D+) of the Karuizawa Trail Running Race, held in Nagano, with a 10.5-hour time limit. 600 places. The next edition had not been announced as of 2026-10-27.
2,700 m of climbing over 43 km (63 m per km).
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 290 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
- Sat, 25 Apr 2026
- Start
- 07:30
- Location
- Nagano, Japan
- Distance
- 43 km
- Elevation gain
- 2,700 m
- Time limit
- 10h 30m
- ITRA
- M
- Official website
- www.nature-scene.net/karuizawa
Elevation profile
No elevation data yet.
Aid stations and cutoffs
| # | Distance | Aid station | Segment | Cutoff |
|---|---|---|---|---|
| F | 43 km | FINISH | 43 km | 18:0010h 30m |
The small figure under each cutoff is the time from the start.
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 (42.6 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.
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