Fujiyoshida, Yamanashi Pref., Japan · Sunday, April 18, 2027

Fixed Distance 50 mi

Fuji 4 Lakes 80 km Challenge

181 days away

80 km Distance

not publishedn/a Climbing

4.0 est Grit · Challenging

Calculated from 80 km alone — the organiser has not published an elevation profile. Read 4.0 as a floor, not a verdict.

35.4875° N, 138.8078° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 11 hours 8:15 min/km average. Tight. Sustained running. Long aid-station stops will cost you. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Among the tightest 50 mi cut-offs we track. Measured against 477 races of the same distance. Cut-off calculator →

Field size ~423 Large. Rarely out of sight of another runner.

DUV results for the 2026 edition (80km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, April

Daytime high 15°C

Night low 4°C

Rainfall Showers likely

Daylight 13 h 09 m of light

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	80km	423	Masaru Shimizu · 05:44:20	Kanako Tomita · 06:41:45
2025	80km	389	Nobu Ishihara · 06:13:14	Mai Aritsuka · 06:08:49

The field grew 9% between 2025 (389) and 2026 (423). 32% of the 2026 field were women.

DUV results for the 2026 edition (80km) — 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.

Gear for this race

Chosen for 80 km of trail.

Trail Running Shoes 80 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 80 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 80 km, without the bounce.
Headlamps 80 km almost certainly means running into the night.
GPS Watches Battery life first — a 80 km day outlasts most full-GPS modes.

Asics

Trabuco Max 3

★★★★★ 4.6

Asics

Trabuco Max 2

★★★★★ 4.7

Maurten

Gel 100

Hydrogel technology for 25g carbs per gel with minimal GI distress.

$3.5 ★★★★★ 4.7

Nathan

VaporKrar 12L

12L race vest co-designed with ultra champion Rob Krar, with insulated bladder pocket.

$170 ★★★★★ 4.6

Nitecore

UT32

Dual-beam trail running headlamp (1100 lumens) with spot and flood beams.

$100 ★★★★★ 4.5

Suunto

Vertical

Titanium GPS watch with solar charging, offline maps, and 140-hour GPS battery.

$630 ★★★★★ 4.5

All gear guides →

Overview

Set in Fujiyoshida, Yamanashi Pref., Japan, the Fuji 4 Lakes 80 km Challenge is a road race scheduled for 2027-04-18. With an 11-hour time limit across 80 km, the race imposes a cut-off pace of 8.3 minutes per kilometer. That leaves little room for extended stops, resulting in a time limit that is tighter than 94% of 50mi cut-offs and more generous than only 6%.

Runners will also share the road with a massive pack. With 423 finishers in 2026, the event features a field bigger than 96% of 50mi peers and smaller than just 4% across 677 comparable races.

Similar races

Other 50 mi trail ultras, closest in distance first.