Minami aso, Japan · Saturday, December 19, 2026

Fixed Distance 50K

Minami-aso caldera Trail

62 days away

50 km Distance

2,491 m Climbing

6.2 Grit · Hardcore

32.8827° N, 131.0947° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 50 m / km Mountain. Significant climbing. Steep sections will require power hiking.

Field size ~128 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2025 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, December

Daytime high 7°C

Night low -1°C

Rainfall Mostly dry

Daylight 9 h 59 m of light

Regional 2001-2020 average for December — NASA POWER, grid elevation 616 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	50km	128	Tomohiro Machida · 05:53:30	Kyona Nonaka · 07:33:48
2024	50km	154	Masaaki Yoshii · 05:38:00	Seika Higashi · 08:33:49
2023	50km	148	Kousuke Miike · 05:34:41	Saeka Nagae · 07:28:24
2022	50km	79	Yukihiro Sasaki · 06:14:10	Natsumi Higashi · 07:47:47

The field shrank 17% between 2024 (154) and 2025 (128). 12% of the 2025 field were women.

DUV results for the 2025 edition (50km) — 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 mountain course. Poles are highly recommended for the sustained climbs.
gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.

Gear for this race

Chosen for 50 km of trail with 2,491 m of ascent.

Trail Running Shoes 50 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 2,491 m of ascent to walk up.
GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.

Adidas

Terrex Speed Ultra

RunRepeat found the Adidas Terrex Speed Ultra to have a grippy outsole and great lockdown, while iRunFar noted that the shoe works on a variety of trail conditi…

★★★★★ 4.5

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

Spring Energy