Ultra Running Hub Yonohara, Okinawa Pref., Japan · Sunday, December 20, 2026
Fixed Distance 50K
Okinawa 50km Ultramarathon
43 days away
50 km Distance
not publishedn/a Climbing
2.5 est Grit · Entry level
Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.
What the course asks
Time limit 8 hours
9:36 min/km average. Tight. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 83% of 50K races. Measured against 1087 races of the same distance. Cut-off calculator →
Field size ~210 Large. Rarely out of sight of another runner.
DUV results for the 2025 edition (50km) — 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 42 m of light
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2025 | 50km | 210 | Kazunari Tomitaka · 03:16:47 | Yuka Tomitaka · 03:59:56 |
| 2024 | 50km | 170 | Kazunari Tomitaka · 03:24:28 | Yurina Kawasaki · 03:42:26 |
| 2023 | 50km | 136 | Kazuki Matsushita · 03:28:10 | Asuka Saito · 04:27:56 |
| 2022 | 50km | 115 | Shinichi Haraguchi · 03:55:05 | Makie Nakajima · 04:07:55 |
| 2019 | 50km | 134 | Naoyuki Nakajima · 03:51:32 | Ruri Wakamatsu · 04:21:06 |
| 2018 | 50km | 98 | Takaaki Futami · 03:34:51 | Mikiko Matsuda · 04:51:47 |
The field grew 24% between 2024 (170) and 2025 (210). 30% of the 2025 field were women.
DUV results for the 2025 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Course notes
- gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 50 km of trail.
- Trail Running Shoes 50 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition 50 km of self-supported fuelling between aid stations.
- Hydration Vests Flask capacity for 50 km, without the bounce.
- GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.
Similar races
Other 50K trail ultras, closest in distance first.