Muraoka, Hyogo Pref., Japan · Sunday, September 27, 2026

Fixed Distance 100K

Muraoka 100 km Ultra Marathon

Race completed

100 km Distance

2,550 m Climbing

8.8 Grit · Elite / extreme

35.4706° N, 134.5983° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 26 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 14 hours 8:24 min/km average. Tight. Sustained running. Long aid-station stops will cost you. Tighter than 81% of 100K races. Measured against 226 races of the same distance. Cut-off calculator →

Field size ~424 Large. Rarely out of sight of another runner.

DUV results for the 2025 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, September

Daytime high 25°C

Night low 19°C

Rainfall Wet — expect rain

Daylight 12 h 01 m of light

Regional 2001-2020 average for September — NASA POWER, grid elevation 242 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	100km	424	Masashi Toyoshima · 08:10:40	Kumi Kinoshita · 09:49:05
2024	100km	316	Masashi Toyoshima · 07:45:03	Kumi Kinoshita · 09:49:57
2023	100km	343	Ryuta Yoshida · 07:52:33	Kumi Kinoshita · 09:43:47
2019	100km	469	Ryuta Yoshida · 07:53:04	Yasuko Doi · 09:33:23
2017	100km	233	Kohei Miyagaki · 07:55:36	Yuko Usuki · 11:06:03
2016	100km	426	Kazuya Ichitsubo · 08:26:23	Aya Doi · 10:00:26
2015	100km	463	Ryuta Yoshida · 07:52:27	Kimiyo Mizuuchi · 10:26:25
2014	100km	436	Ryuta Yoshida · 07:49:48	Miki Iwamoto · 10:30:31
2013	100km	229	Ryuta Yoshida · 08:04:50	Michiko Hayase · 10:09:16
2012	100km	254	Ryuta Yoshida · 07:59:46	Michiko Hayase · 09:58:26

The field grew 34% between 2024 (316) and 2025 (424). 12% of the 2025 field were women.

DUV results for the 2025 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

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.
nutrition For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

Gear for this race

Chosen for 100 km of trail with 2,550 m of ascent.

Trail Running Shoes 26 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 2,550 m of ascent to walk up.
Headlamps A 14 h limit puts you out there after dark.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

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

Black Diamond

Distance FLZ

Lightweight folding trekking poles with FlickLock Z adjustment. 340g per pole.

$170 ★★★★★ 4.7

Nitecore

UT32

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

$100 ★★★★★ 4.5

All gear guides →

Overview

The Muraoka 100 km Ultra Marathon was a road race held in Muraoka, Hyogo Pref., Japan. The course had 2550m of elevation gain over its 100km, which meant 25.5m of climb per kilometer. The latest edition in 2025 had 424 finishers.

The 14-hour time limit was tighter than 81% of 100k cut-offs, allowing for a cutoff pace of 8.4 minutes per kilometer. The field was bigger than 93% of 100k fields.

The race was first run in 2012, and the 2025 edition was the 10th.

Similar races

Other 100K trail ultras, closest in distance first.