3 races in date order
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FunTrails Round Chichibu & Okumusashi
A loop through the Chichibu and Okumusashi mountains
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Ageo City Half Marathon
Where Japan's fastest half marathon times are made
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Koedo Kawagoe Half Marathon
Runs past Kawagoe's Edo-era Kurazukuri warehouse street
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.