Running Races in Colorado
Colorado has 409 upcoming running races scheduled for 2026. Most of the calendar falls in the warmer months: 304 of 409 races (74%) take place between May and September, with July (82 events) the busiest month. No single city dominates the calendar. Colorado Springs leads with 55 races, followed by Denver (33), Centennial (29), and Littleton (21). The remaining 66% of the calendar is spread across smaller cities.
Running races by month in Colorado
Jul (82) · Aug (73) · Sep (73) · Jun (71) · Oct (41) · Nov (31) · Dec (18) · Feb (5) · May (5) · Mar (4) · Apr (4) · Jan (2)
Notable Colorado events
- Bound for Boston Marathon & Half — Denver, August 2 — Boston-qualifier marathon and half marathon
- Pikes Peak Marathon — Manitou Springs, September 19 — mountain marathon
Showing 24 of 409
Running
Sam's Rainbow Run
Fort Collins, CO
Sam's Rainbow Run
Running
Boulder Stroke & Stride
Boulder, CO
Boulder Stroke & Stride
Running
The Hundo 100K MTB
Pinecliffe, CO
The Hundo 100K MTB
Running
2026 IRONMAN 70.3 Boulder
Boulder, CO
2026 IRONMAN 70.3 Boulder
St Mary's Church "Loop the Lake 5K" at Lathrop State Park
Garden of the Gods Little Horn and Big Horn Kids Races
Running
The Springs Downhill Mile
Colorado Springs, CO
The Springs Downhill Mile
