Race calendar · Saitama, Japan
Running races in Saitama
4 upcoming races across Saitama. Every date checked against the organiser. Your next race, seen from above.
Chichibu, Saitama · seen from above
4 upcoming races across Saitama. Every date checked against the organiser. Your next race, seen from above.
A loop through the Chichibu and Okumusashi mountains
Where Japan's fastest half marathon times are made
Runs past Kawagoe's Edo-era Kurazukuri warehouse street
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.