Ultra Running Hub Yorii, Saitama Pref., Japan · Sunday, November 29, 2026
Trainic world Soto-Chichibu Trail Run 50km
What the course asks
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, November
Regional 2001-2020 average for November — NASA POWER, grid elevation 264 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2025 | 50km | 127 | Naoki Satani · 05:37:57 | Marie Noda · 07:37:09 |
| 2024 | 50km | 143 | Kensuke Yoshimura · 05:52:27 | Nanako Sako · 07:12:05 |
| 2023 | 52km | 118 | Tomokazu Fujiwara · 06:39:17 | Kayo Izumi · 08:04:55 |
| 2022 | 52km | 182 | Wataru Sato · 05:58:33 | Mina Kitamura · 07:31:31 |
| 2019 | 53km | 269 | Tomohiro Machida · 05:56:15 | Akiko Ikeuchi · 07:23:54 |
| 2018 | 49.8km | 285 | Yuichi Hosoyama · 05:46:14 | Hiroko Suzuki · 07:05:08 |
| 2017 | 49.8km | 239 | Yuichi Hosoyama · 06:15:56 | Ruriko Ogawa · 08:11:38 |
| 2016 | 49.8km | 292 | Hironori Tasaka · 05:43:11 | Masae Masa · 06:31:48 |
The field shrank 11% between 2024 (143) and 2025 (127). 12% 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
- 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 46 km of trail with 2,900 m of ascent.
- Trail Running Shoes 63 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition 46 km of self-supported fuelling between aid stations.
- Hydration Vests Pole attachment and chest-strap stability on steep ground.
- Trekking Poles 2,900 m of ascent to walk up.
- GPS Watches Battery life first — a 46 km day outlasts most full-GPS modes.
Overview
Organised by NPO Koedo Oedo Training World, this 46-kilometre trail race in Yorii, Saitama Pref., packs 2900 metres of elevation gain into its point-to-point route. Averaging 63 metres of climb per kilometre, the profile demands steep mountain work on a course that travels from Yorii Town Hall over summits like Mt. Kanekidoyama and Mt. Ohira before finishing toward Opark Ogose.
The 11-hour time limit gives participants a 14.3-minute-per-kilometre pace cutoff, making the schedule more generous than 70% of 50k cut-offs and tighter than 30%. That forgiving buffer leaves room to negotiate the repeated climbs, Habara Pass, and castle ruins along the way.
With 127 finishers in 2025 across an event history running since 2016, the race draws a bigger field than 84% of 50k events and smaller than 16%. Registration costs 8000 Yen for the scheduled November 2026 edition.
Similar races
Other 50K trail ultras, closest in distance first.