Ultra Running Hub Okinoshima, Shimane Pref., Japan · Sunday, June 21, 2026
Okinoshima 50km Ultra Marathon
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
DUV results for the 2026 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, June
Regional 2001-2020 average for June — NASA POWER, grid elevation 10 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2026 | 50km | 454 | Kenji Nonaka · 03:19:04 | Miku Morioka · 04:32:14 |
| 2025 | 50km | 460 | Yuki Kawauchi · 03:08:04 | Miku Morioka · 04:20:19 |
| 2024 | 50km | 368 | Kenji Nonaka · 03:19:07 | Miku Morioka · 04:22:07 |
| 2023 | 50km | 382 | Yuki Kawauchi · 03:04:58 | Yuko Muto · 04:26:38 |
| 2022 | 50km | 272 | Kenji Nonaka · 03:32:22 | Naomi Aihara · 04:38:46 |
| 2019 | 50km | 508 | Hiroshi Doi · 03:23:14 | Yuka Yoshimura · 03:57:26 |
| 2018 | 50km | 481 | Kenichi Tanaka · 03:23:15 | Yuka Yoshimura · 03:56:51 |
| 2017 | 50km | 501 | Kenichi Tanaka · 03:26:53 | Yuka Yoshimura · 04:03:20 |
| 2016 | 50km | 482 | Fumio Yamane · 03:34:19 | Yuka Yoshimura · 03:52:57 |
| 2015 | 50km | 538 | Koki Kawauchi · 03:15:20 | Asumi Tamura · 03:53:34 |
The field has held steady: 460 in 2025, 454 in 2026. 24% of the 2026 field were women.
DUV results for the 2026 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 road terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 50 km of road.
- Trail Running Shoes 50 km of road — 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.
Overview
Held in Okinoshima, Shimane Pref., Japan, the Okinoshima 50km Ultra Marathon was a road race that drew a massive gathering for the distance, boasting a field bigger than 97% of 50k peers and smaller than only 2%. The point-to-point route circled Dodo island, sending runners off at 11:30 from the 50-kilometer mark of the concurrent 100-kilometer event.
The 8-hour time limit enforced a strict standard, tighter than 84% of 50k races and more generous than just 16%. Entrants had to sustain an overall pace faster than 9.6 minutes per kilometer across the full 50 kilometers of pavement to beat the clock.
Similar races
Other 50K road ultras, closest in distance first.