Yonohara, Okinawa Pref., Japan · Sunday, December 20, 2026

Fixed Distance 100K

Okinawa 100km Ultramarathon

63 days away

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.

What the course asks

Time limit 14 hours 8:24 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 Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Tighter than 81% of 100K races. Measured against 226 races of the same distance. Cut-off calculator →

Field size ~620 Very large. Congested start, busy aid stations.

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, December

Daylight 9 h 42 m of light

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	100km	620	Taiki Abe · 07:05:37	Haruka Yamaguchi · 08:22:35
2024	100km	538	Yusuke Kodama · 07:20:56	Akiko Takigahira · 08:17:27
2023	100km	556	Jumpei Yamaguchi · 06:22:45	Yurika Kitaya · 08:44:23
2022	100km	468	Taku Fujiwara · 07:12:29	Tomomi Bitoh · 09:08:09
2019	100km	459	Hideyuki Mamiya · 07:13:55	Miho Nakata · 07:47:34
2018	100km	358	Fuyuharu Nakahashi · 07:45:54	Konoka Azumi · 07:55:50
2017	100km	347	Takayuki Kibata · 07:44:10	Rumi Shimizu · 09:06:51
2016	100km	334	Shingo Nosaka · 07:35:35	Yayoi Fukushima · 09:46:46

The field grew 15% between 2024 (538) and 2025 (620). 20% 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

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.

La Sportiva

Prodigio Pro

RunRepeat found the La Sportiva Prodigio Pro to have a secure, locked-in fit due to its premium upper, and also praised the shoe's energetic ride, particularly…

$225 ★★★★★ 4.6

Salomon