9 races in date order
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Shibamata 100K
Flat out-and-back along the Edogawa River floodplain
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Moriguchi Ecomarathon
Riverside course along the Yodo River in Moriguchi
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Hida Takayama Ultramarathon
Through Takayama's old sake town and the Hida Alps
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Kagaspa Trail Endurance 100 by UTMB
Rhododendron forests and 360-degree mountain views in Japan
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Okinoshima Ultramarathon
Japan's 50K record race on a remote Oki Island
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Deep Japan Ultra 100
Trail ultra through Niigata's mountainous Uonuma region
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Hakodate Marathon
Coastal course past Hakodate's Red Brick Warehouse district
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Saroma Lake 100km Ultramarathon
The world's fastest 100K, flat beside Saroma Lake
Your next race, seen from above.
Save any of these to your season in RunCalendar and hear the morning entries open. Free on iPhone, no account needed.
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Save any of these to your season in RunCalendar and hear the morning entries open. Free on iPhone, no account needed.
Every race here is published by its organiser; RunCalendar checks the date and the entry window against the organiser's own page and rebuilds this calendar every night. A confirmed date shows its day; a provisional one shows only its month. Last updated 22 October 2026.