Aga Ultra Marathon - 100km

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.

What the course asks

Time limit 10.5 hours 6:18 min/km average. Tight. You are racing the clock from the start. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. Among the tightest 100K cut-offs we track. Measured against 233 races of the same distance. Cut-off calculator →

Field size ~28 Small. Long stretches with nobody in sight.

DUV results for the 2025 edition (105km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, September

Daylight 12 h 01 m of light

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	105km	28	Ryohei Tanaka · 08:16:35	Katura Oono · 10:25:05
2023	100km	42	Ryota Takai · 09:03:45	Reiko Ito · 11:11:31
2022	86km	17	Masaru Ishigaki · 08:54:31	Miyuki Takata · 10:16:13
2021	90km	3	Kazuhisa Shinbo · 09:02:00	—

The field shrank 33% between 2023 (42) and 2025 (28). 11% of the 2025 field were women.

DUV results for the 2025 edition (105km) — 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 100 km almost certainly means running into the night.
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