10K races in Colorado — October 2026

14 upcoming 10K races in Colorado during October 2026.

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This calendar in numbers

This calendar currently lists 14 upcoming events, from Oct 3, 2026 to Oct 31, 2026. October is the busiest month, with 14 events scheduled. Events are spread across 12 different locations; Denver hosts the most (3). Course distances range from 5 km to 10 km.