Minamiaso Caldera Trail

About the Event

Conquer a trail running masterpiece at the Minamiaso Caldera Trail, a premier winter event set within the majestic expanse of the world's largest caldera in Aso-Kuju National Park. This ITRA-certified race, serving as a UTMB World Series Qualifier for its 50km course, offers an unparalleled challenge across four stunning distances: 50km, 30km, 18km, and a 2km fun run. Test your limits on a course that winds through the silent, snowy landscapes of Minamiaso Village, where breathtaking volcanic vistas and pristine nature provide a truly epic backdrop. With guest runners and a vibrant festival atmosphere, it's more than a race—it's a destination adventure for the global trail community. Secure your spot for a world-class running experience that defines the spirit of Japanese mountain endurance.

Races Offered

18km

Dec 20, 2025

straighten

Distance — 18K

terrain

Type — —

timer

-66 days remaining

2km

Dec 20, 2025

straighten

Distance — 2K

terrain

Type — —

timer

-66 days remaining

30km

Dec 20, 2025

straighten

Distance — 30K

terrain

Type — —

timer

-66 days remaining

50km

Dec 20, 2025

straighten

Distance — 50K

terrain

Type — —

timer

-66 days remaining

Weather Overview

These values represent the 3-year monthly averages for December in Minamiaso.

Temp (°C)

Feels Like (°C)

thermostat 1.1° / 8.6°

wb_sunny -2.2° / 4.6°

Wind (km/h)

Humidity (%)

air 8.1 /

water_drop 77.3%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 1.1° / 8.6°

wb_sunny -2.2° / 4.6°

air 8.1 km/h

water_drop 77.3%

About Minamiaso

Learn more about the host city, Minamiaso.

Minamiaso is a village in Aso District, Kumamoto Prefecture, Japan. As of 31 July 2024, the village had an estimated population of 10,071 in 4821 households, and a population density of 73 persons per km2. The total area of the village is 137.32 km2 (53.02 sq mi).