10K races in Colorado, United States — 2026 running calendar

Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

06 Jun, 2026 (Sat) – 12 Dec, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

SuperHeroes Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

06 Jun, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

The Steamboat Marathon

Steamboat Springs, Colorado, United States

07 Jun, 2026 (Sun)

$85.00 - $170.00

Running

Marathon Half-Marathon 10K

DU Dash Colorado

Palmer Lake, Colorado, United States

07 Jun, 2026 (Sun)

$45.00

Running

5K 10K

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

Louisville, Colorado, United States

07 Jun, 2026 (Sun)

$45.00 - $75.00

Running

Half-Marathon 10K 5K

All-Out Summer Breeze

Arvada, Colorado, United States

13 Jun, 2026 (Sat)

$40.00 - $85.00

Running

Half-Marathon 10K 5K +2

Treat Trot - Denver

Thornton, Colorado, United States

13 Jun, 2026 (Sat)

$22.00 - $44.00

Running

1.6K 5K 10K 15K

Garden of the Gods 10 Mile/10K and Trail Run

Colorado Springs, Colorado, United States

14 Jun, 2026 (Sun)

$15.00 - $90.00

Running, Trail running

16.1K 10K 4.7K

Treat Trot Colorado Springs

Colorado Springs, Colorado, United States

14 Jun, 2026 (Sun)

$22.00 - $42.00

Running

1.6K 5K 10K 15K

The Bullfrog Splashdown

Littleton, Colorado, United States

14 Jun, 2026 (Sun)

Free - $84.00

Running

10K 5K 2.4K 8.9K

Sloth Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

20 Jun, 2026 (Sat) – 29 Aug, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

20 Jun, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2