Ultra Running Hub Nagano Pref., Japan · Saturday, June 5, 2027
Fixed Distance 50K
Okushinano 100 - 50 km
210 days away
52.4 km Distance
2,390 m Climbing
6.2 Grit · Hardcore
What the course asks
Climbing rate 46 m / km
Mountain. Significant climbing. Steep sections will require power hiking.
Time limit 11.5 hours
13:10 min/km average. Comfortable. Room to walk the climbs and stop at aid. More forgiving than 63% of 50K races. Measured against 1087 races of the same distance. Cut-off calculator →
Field size ~332 Large. Rarely out of sight of another runner.
DUV results for the 2026 edition (52.4km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, June
Daylight 14 h 30 m of light
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2026 | 52.4km | 332 | Jun Aoki · 04:49:09 | Nami Mitsui · 05:51:34 |
| 2025 | 52.4km | 339 | Ander Inarra Olaziregi · 04:28:47 | Yuri Yoshizumi · 05:10:29 |
| 2024 | 52.4km | 341 | Hajime Kasagi · 04:41:33 | Yukari Seimiya · 05:29:28 |
| 2023 | 50km | 322 | Norihito Goto · 05:21:14 | Reika Itabashi · 06:46:52 |
| 2022 | 50km | 280 | Kento Tamura · 04:43:21 | Yukari Tanaka · 06:59:47 |
The field has held steady: 339 in 2025, 332 in 2026. 31% of the 2026 field were women.
DUV results for the 2026 edition (52.4km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Course notes
- terrain This is a mountain course. Poles are highly recommended for the sustained climbs.
- gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 52 km of trail with 2,390 m of ascent.
- Trail Running Shoes 46 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition 52 km of self-supported fuelling between aid stations.
- Hydration Vests Pole attachment and chest-strap stability on steep ground.
- Trekking Poles 2,390 m of ascent to walk up.
- GPS Watches Battery life first — a 52 km day outlasts most full-GPS modes.
Similar races
Other 50K trail ultras, closest in distance first.