Lake Saroma 100 Km Ultramarathon

Race completed

100 km Distance

not publishedn/a Climbing

5.0 est Grit · Challenging

Calculated from 100 km alone — the organiser has not published an elevation profile. Read 5.0 as a floor, not a verdict.

44.1515° N, 143.5730° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Time limit 13 hours 7:48 min/km average. Firm. 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 Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 87% of 100K races. Measured against 207 races of the same distance. Cut-off calculator →

Field size ~2,632 Very large. Congested start, busy aid stations.

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, June

Daytime high 19°C

Night low 10°C

Rainfall Mostly dry

Daylight 15 h 29 m of light

Regional 2001-2020 average for June — NASA POWER, grid elevation 190 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2026	100km	2,632	Taketoshi Ooe · 06:10:22	Akiko Maruichi · 07:22:22
2025	100km	1,936	Kok-Wai Tse · 06:28:36	Mikiko Ota · 07:32:17
2024	100km	1,764	Jumpei Yamaguchi · 06:10:02	Mikiko Ota · 07:45:08
2023	100km	1,930	Jumpei Yamaguchi · 06:06:07	Mikiko Ota · 07:28:39
2019	100km	2,405	Tatsuya Itagaki · 06:25:51	Mai Fujisawa · 07:32:48
2018	100km	2,402	Nao Kazami · 06:09:14	Mai Fujisawa · 07:37:56
2017	100km	2,311	Tatsuya Itagaki · 06:14:18	Yuri Kano · 07:37:21
2016	100km	2,682	Tatsuya Itagaki · 06:37:05	Hisayo Matsumoto · 07:39:51
2015	100km	2,721	Yoshikazu Hara · 06:35:49	Chiyuki Mochizuki · 07:36:39
2014	100km	1,829	Hideo Nojo · 06:40:15	Chiyuki Mochizuki · 07:55:09

The field grew 36% between 2025 (1,936) and 2026 (2,632). 14% 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.

The Aid Station

Course-specific beta from the community

👟 gear

With road terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

🥤 nutrition

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

By UltraHub Expert

Gear for this race

Chosen for 100 km of road.

Trail Running Shoes 100 km of road — 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 13 h limit puts you out there after dark.
Accessories Chafe and blisters end more 100 km races than fitness does.