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

Christmas 5K/10K/Half Marathon in July Meet Up - Denver

Littleton, Colorado, United States

Jul 25, 2026 (Sat)

$35.00

Running

5K 10K Half-Marathon

Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Jul 25, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Run for Donuts 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Jul 25, 2026 (Sat) – Sep 26, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Popsicle 5K/10K/Half - Colorado Springs

Colorado Springs, Colorado, United States

Aug 1, 2026 (Sat)

$35.00 - $60.00

Running

5K 10K Half-Marathon +5

Choice City Running Festival

Fort Collins, Colorado, United States

Aug 7, 2026 (Fri) – Aug 8, 2026

Free - $78.00

Running

1.6K 5K 10K Half-Marathon +4

Summer Sizzler- Denver

Thornton, Colorado, United States

Aug 8, 2026 (Sat)

$22.00 - $44.00

Running

1.6K 5K 10K 15K

Eat. Run. Adopt. 10K

Berthoud, Colorado, United States

Aug 8, 2026 (Sat)

$60.00

Running

10K

All-Out Runapalooza

Arvada, Colorado, United States

Aug 8, 2026 (Sat)

$40.00 - $353.00

Running

Half-Marathon 10K 5K +2

Summer Sizzler- Colorado Springs

Colorado Springs, Colorado, United States

Aug 9, 2026 (Sun)

$22.00 - $42.00

Running

1.6K 5K 10K 15K

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

Centennial, Colorado, United States

Aug 15, 2026 (Sat) – Oct 10, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Run for PB& J 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Aug 15, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

2026 True Impact Ministries 5K/10K

Centennial, Colorado, United States

Aug 22, 2026 (Sat)

$39.00

Running

5K 10K