Course
100 Mile102.5 mi
Key dates
- ★Race dayOctober 2027 · date to be announced
Provisional date, projected from last year — the organiser has not announced this edition yet. We show the month only.
About
OSJ Koumi 100 is a 100-mile mountain trail race through Koumi, in Nagano Prefecture, part of the OSJ Trail Running Race Series.
Your next race, seen from above.
Save OSJ Koumi 100 to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Save OSJ Koumi 100 to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.