2 races in date order
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Yatsugatake Nobeyama Kogen 100km Ultramarathon
Japan's classic highland 100K, cool air and open views
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Karuizawa Half Marathon
Rolling loop through Karuizawa's forests and resort town
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.
Get RunCalendar
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.