Three loops through mountains, ancient beech forests, and orchard country of Northern Nagano
Other trail races within 165 miles
A 100km loop through three distinct landscapes of Northern Nagano's Oku-Shinano region: the mountains surrounding solitary Mt. Kosha, primeval beech forests with trees over 300 years old, and the rural orchards and pastoral countryside of Kijimadaira Village. Runners traverse centuries-old mountain trails connecting remote hamlets, stream-fed valleys, and agricultural land still bearing the character of Japan's heavy-snowfall interior. The course combines technical mountain terrain with scenic village running, starting and finishing at the Cupid of Romance Snow Resort. Bear bells are mandatory gear, reflecting the wild nature of the course. A Western States 100 2027 qualifying race carrying 4 ITRA points.
Experienced ultrarunners
Kijimadaira, Nagano, JapanJune 06, 2026
Okushinano 100K is a loop trail race in Kijimadaira, Nagano, Japan, held on June 06, 2026. The course covers 100 km, climbs 4,925 m, and has a 21h cutoff.
| Location | km | Elevation | Cutoff | Crew | Pacers | Drop bags |
|---|---|---|---|---|---|---|
Start Start | 0.0 | 605 m | — | |||
Donguri Park Aid Station | 13.0 | 756 m | — | Crew | ||
Venue Aid Station | 27.0 | 605 m | 6h11:00 AM | Crew | Pacers | Drop Bags |
Kayanodaira Water Aid Aid Station | 38.0 | 1,350 m | 10h30m3:30 PM | Crew | Pacers | |
Kayanodaira 1 Aid Station | 48.0 | 1,535 m | 11h30m4:30 PM | Crew | Pacers | |
Kayanodaira 2 Aid Station | 58.0 | 1,535 m | 13h30m6:30 PM | Crew | ||
Nukasen 1 Aid Station | 72.0 | 739 m | 15h30m8:30 PM | Pacers | ||
Keyakinomori Park Aid Station | 84.0 | 472 m | 17h30m10:30 PM | Crew | ||
Nukasen 2 Aid Station | 95.0 | 739 m | 19h30m12:30 AM +1 | |||
Finish Finish | 100.0 | 604 m | 21h2:00 AM +1 | Crew |
Aid station details for this race are still being filled in. Cutoffs and access rules come from the race’s own published information and can change — check the official race details before planning around them.
Sign in for race-day weather at every station, points of interest, segment-by-segment analysis, pacing, and to save this race to your calendar.
June mountain weather in Northern Nagano can bring sudden rain and rapidly changing conditions. Rain gear is mandatory.
Night temperatures drop significantly at elevation. The 5am start means runners will finish in pre-dawn hours (up to 2am).
Black bears are present throughout the course area. A bear bell is mandatory gear for all 100km and 50km runners.
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