Ultra Running Hub Ishioka, Ibaraki Pref., Japan · Sunday, September 27, 2026
Tsukuba Renjyo 50 Km Road & Trail Run
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, September
Regional 2001-2020 average for September — NASA POWER, grid elevation 33 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2025 | 50km | 169 | Yuki Komai · 04:31:07 | Hiroko Kajiro · 05:38:39 |
| 2024 | 48km | 188 | Terunobu Kurokawa · 04:08:12 | Shiori Kato · 05:10:15 |
| 2023 | 48km | 235 | Jun Aoki · 04:28:29 | Yuki Maruyama · 06:23:10 |
| 2022 | 48km | 129 | Norihito Goto · 04:22:07 | Kayoko Kanehara · 05:41:05 |
| 2019 | 48km | 218 | Takashiro Hoshi · 04:26:47 | Mayumi Noda · 05:44:50 |
| 2018 | 48km | 192 | Yuichi Hosoyama · 04:15:06 | Hong-Mei (Kobai) Li · 05:42:37 |
| 2017 | 48km | 177 | Yuichi Hosoyama · 04:07:11 | Yoshiko Katano · 05:28:10 |
| 2016 | 48km | 190 | Wataru Iino · 04:10:51 | Yoshiko Katano · 05:21:40 |
| 2015 | 48km | 274 | Mika Taniguchi · 04:31:45 | Yoshiko Katano · 05:07:15 |
| 2014 | 48km | 123 | Yukio Shigemoto · 04:27:50 | Yoshiko Katano · 05:20:23 |
The field shrank 10% between 2024 (188) and 2025 (169). 18% 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 rolling course. Expect fast, runnable sections where rhythm is key.
- gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 50 km of trail with 1,667 m of ascent.
- Trail Running Shoes 33 m of climb per kilometre — grip and rock protection before cushioning.
- Race Nutrition 50 km of self-supported fuelling between aid stations.
- Hydration Vests Pole attachment and chest-strap stability on steep ground.
- Trekking Poles 1,667 m of ascent to walk up.
- GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.
Overview
The Tsukuba Renjyo 50 Km Road & Trail Run took place in Ishioka, Ibaraki Pref., Japan, packing 1667 meters of elevation gain across its 50-kilometer course. That profile works out to 33.3 meters of climb per kilometer, presenting a sustained uphill workload throughout the route.
An 8.5-hour time limit demanded a minimum pace of 10.2 minutes per kilometer, giving the event a cut-off tighter than 76% of 50k races and more generous than 24%. That compressed timeline left runners little room to recover from slow climbs on the trail sections.
With 169 finishers in 2025 across 10 editions dating back to 2014, the event drew a bigger field than 88% of 50k races and smaller than 12%—putting runners into a pack far larger than the typical ultra at this distance.
Similar races
Other 50K trail ultras, closest in distance first.