Ultra Running Hub Moroyama, Saitama Pref., Japan · Sunday, October 18, 2026
Ultramarathon Okumusashi Quintet
Calculated from 70 km alone — the organiser has not published an elevation profile. Read 3.5 as a floor, not a verdict.
What the course asks
DUV results for the 2025 edition (70km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, October
Regional 2001-2020 average for October — NASA POWER, grid elevation 264 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2025 | 70km | 511 | Kiyotaka Imai · 05:09:42 | Tomomi Hara · 06:10:41 |
| 2024 | 70km | 673 | Kiyotaka Imai · 05:14:51 | Ryoko Tanabe · 06:16:32 |
| 2023 | 78km | 814 | Hiromasa Tanaka · 05:54:03 | Miho Nakata · 06:14:10 |
| 2022 | 78km | 853 | Hiromasa Tanaka · 05:41:17 | Miho Nakata · 05:54:32 |
| 2019 | 78km | 1,510 | Makoto Yajima · 05:41:41 | Miho Nakata · 06:43:06 |
| 2018 | 78km | 1,396 | Kota Tachikawa · 05:42:12 | Tomoko Mitsuhashi · 06:51:19 |
| 2017 | 78km | 1,442 | Makoto Yajima · 05:36:35 | Yuko Ota · 06:59:06 |
| 2016 | 78km | 1,422 | Kota Tachikawa · 05:31:07 | Tomoko Oba · 06:25:50 |
| 2015 | 77km | 1,376 | Kiryou Sakamoto · 05:21:56 | Tomoko Oba · 06:30:20 |
| 2014 | 77km | 1,033 | Hideo Takahashi · 06:03:22 | Tomoko Oba · 06:51:42 |
The field shrank 24% between 2024 (673) and 2025 (511). 20% of the 2025 field were women.
DUV results for the 2025 edition (70km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
The Aid Station
Course-specific beta from the community
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 70 km of trail.
- Trail Running Shoes 70 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition 70 km of self-supported fuelling between aid stations.
- Hydration Vests Flask capacity for 70 km, without the bounce.
- Headlamps A 12 h limit puts you out there after dark.
- GPS Watches Battery life first — a 70 km day outlasts most full-GPS modes.
Overview
The Ultramarathon Okumusashi Quintet is a 70 km road race in Moroyama, Saitama Pref., Japan, held annually in October. With 511 finishers in 2025, it has a larger field than 97% of 654 comparable 50-mile events.
The 12-hour time limit imposes a cutoff pace of 10.3 minutes per kilometer. This cutoff is tighter than 68% of 457 peer 50-mile races, offering less margin for error than most races of this distance. The event, organized by Sports Aid Japan, has been held 10 times since 2014, with the next edition on October 18, 2026.
Similar races
Other 50 mi trail ultras, closest in distance first.