Ultra Running Hub Chiba Pref., Japan · Sunday, December 13, 2026
Fixed Distance 50 mi
Coast to Coast Boso hanto
36 days away
67 km Distance
3,476 m Climbing
8.6 Grit · Elite / extreme
What the course asks
Climbing rate 52 m / km
Mountain. Significant climbing. Steep sections will require power hiking.
Field size ~429 Large. Rarely out of sight of another runner.
DUV results for the 2024 edition (67km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, December
Daylight 9 h 44 m of light
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2024 | 67km | 429 | Yusuke Nakasai · 06:46:21 | Natsumi Yamauchi · 07:49:25 |
| 2023 | 70km | 387 | Tomohiro Machida · 06:19:32 | Naho Kotani · 07:31:35 |
The field grew 11% between 2023 (387) and 2024 (429). 10% of the 2024 field were women.
DUV results for the 2024 edition (67km) — 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 67 km of trail with 3,476 m of ascent.
- Trail Running Shoes 52 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition 67 km of self-supported fuelling between aid stations.
- Hydration Vests Pole attachment and chest-strap stability on steep ground.
- Trekking Poles 3,476 m of ascent to walk up.
- GPS Watches Battery life first — a 67 km day outlasts most full-GPS modes.
Similar races
Other 50 mi trail ultras, closest in distance first.