Ultra Running Hub Fujiyoshida, Yamanashi Pref., Japan · Sunday, April 18, 2027
Fuji 4 Lakes 100 km Challenge
Calculated from 100 km alone — the organiser has not published an elevation profile. Read 5.0 as a floor, not a verdict.
What the course asks
DUV results for the 2026 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, April
Regional 2001-2020 average for April — NASA POWER, grid elevation 732 m. Not a forecast.
Results history
| Year | Race | Finishers | Men's winner | Women's winner |
|---|---|---|---|---|
| 2026 | 100km | 1,529 | Masato Namai · 06:55:46 | Yuka Tomitaka · 08:34:54 |
| 2025 | 100km | 1,536 | Ryotaro Kamoshida · 07:01:08 | Haruna Takano · 07:54:27 |
| 2024 | 100km | 1,410 | Yusuke Kodama · 06:56:12 | Mai Aritsuka · 08:03:18 |
| 2023 | 100km | 1,143 | Tatsuya Itagaki · 07:16:57 | Natsuki Tomii · 07:48:37 |
| 2022 | 100km | 1,259 | Hiroki Kai · 06:54:51 | Aiko Kanematsu · 08:02:17 |
| 2019 | 100km | 1,425 | Toru Somiya · 07:21:09 | Aiko Kanematsu · 08:49:38 |
| 2018 | 100km | 1,227 | Tatsuya Itagaki · 07:09:40 | Sonoka Nakayama · 08:50:54 |
| 2017 | 100km | 1,279 | Hiroumi Kamata · 07:28:13 | Tomoko Mitsuhashi · 09:15:47 |
| 2016 | 100km | 1,160 | Tatsuya Itagaki · 06:54:05 | Yumiko Yanagisawa · 09:13:35 |
| 2015 | 100km | 1,254 | Tomoya Sugimoto · 07:32:47 | Yuko Kusunose · 09:04:01 |
The field has held steady: 1,536 in 2025, 1,529 in 2026. 17% of the 2026 field were women.
DUV results for the 2026 edition (100km) — 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.
- nutrition For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.
Gear for this race
Chosen for 100 km of trail.
- Trail Running Shoes 100 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
- Hydration Vests Flask capacity for 100 km, without the bounce.
- Headlamps A 14 h limit puts you out there after dark.
- Accessories Chafe and blisters end more 100 km races than fitness does.
Overview
The Fuji 4 Lakes 100 km Challenge is a road race held in Fujiyoshida, Yamanashi Pref., Japan, on April 18, 2027. It offers a 100 km course with a 14-hour time limit. This time limit is tighter than 81% of 100k cut-offs, meaning a relatively fast pace of 8.4 minutes per kilometer is required to finish within the allotted time. It is more generous than 19% of 100k cut-offs.
With 1529 finishers at its latest edition in 2026, this race draws a field bigger than 99% of 100k races. It is smaller than 1% of 100k fields. The race has been run 10 times since its first year in 2015, with the 2027 edition being its next scheduled event.
Similar races
Other 100K trail ultras, closest in distance first.