Running Race Calendar in Colorado, United States

Colorado 13er (Half Marathon/10k/5k)

Louisville, Colorado, United States

07 Jun, 2026 (Sun)

$45.00 - $75.00

Running

Half-Marathon 10K 5K

Flamingo Day 5K

Denver, Colorado, United States

07 Jun, 2026 (Sun)

$36.00

Running

5K

RMRR June Trophy Series

Denver, Colorado, United States

07 Jun, 2026 (Sun)

$10.00

Running

4K

BRR All-Comers Summer Track & Field Series #1

Boulder, Colorado, United States

11 Jun, 2026 (Thu)

$15.00 - $20.00

Running

Ultra 1.6K 3K +1

Sam's Rainbow Run

Fort Collins, Colorado, United States

13 Jun, 2026 (Sat)

Free - $40.00

Running

5K 1.6K

Treat Trot - Denver

Thornton, Colorado, United States

13 Jun, 2026 (Sat)

$22.00 - $44.00

Running

1.6K 5K 10K 15K

Guardian Games

Loveland, Colorado, United States

13 Jun, 2026 (Sat)

Running

Howelsen Hill Trail Run

Steamboat Springs, Colorado, United States

13 Jun, 2026 (Sat)

$30.75 - $45.75

Running

12.9K 6.4K

Stepping Stone 5K

Littleton, Colorado, United States

13 Jun, 2026 (Sat)

$35.00

Running

5K 2.5K

All-Out Summer Breeze

Arvada, Colorado, United States

13 Jun, 2026 (Sat)

$40.00 - $85.00

Running

Half-Marathon 10K 5K +2

The Springs Downhill Mile

Colorado Springs, Colorado, United States

13 Jun, 2026 (Sat)

$25.00

Running

1.6K

Tutu Dash 5K

Broomfield, Colorado, United States

13 Jun, 2026 (Sat)

$20.00 - $32.50

Running

5K 1.6K