Half marathons in Colorado

20 upcoming half marathons in Colorado. Filter by date, exact distance, or elevation.

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This calendar in numbers

This calendar currently lists 20 upcoming events, from Sep 25, 2026 to Jun 9, 2027. October is the busiest month, with 9 events scheduled. Events are spread across 17 different locations; Colorado Springs hosts the most (4). Course distances range from 15 km to 21.1 km.