Ultramarathons in Japan in December 2026
8 ultramarathons in Japan in December 2026.
6 cities
Busiest: December
From €43
Upcoming races
Your guide to ultramarathons in Japan in December 2026
There are 8 upcoming ultramarathons in Japan in December 2026, spread across 6 cities. Filter by distance or terrain to narrow things down, and save the races you like the look of.
Most take place in December. Next up is 4th Coast to Coast Boso hanto - 67 km in Chiba Pref. on 13 December 2026.
Questions runners ask
How many ultramarathons in Japan in December 2026 are there?
Finndu lists 8 upcoming ultramarathons in Japan in December 2026, across 6 towns and cities. The list is updated twice a day as organisers announce new races.
When is the next one?
4th Coast to Coast Boso hanto in Chiba Pref., on 13 December 2026.
How much does it cost to enter?
Entry starts from JP¥8,000. Fees vary from race to race, so check each race page for its current price.