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

All-Out Summer Breeze

Arvada, Colorado, United States

Jun 13, 2026 (Sat)

Running

Half-Marathon 10K 5K +2

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

Louisville, Colorado, United States

Jun 7, 2026 (Sun)

Running

Half-Marathon 10K 5K

DU Dash Colorado

Palmer Lake, Colorado, United States

Jun 7, 2026 (Sun)

Running

5K 10K

The Steamboat Marathon

Steamboat Springs, Colorado, United States

Jun 7, 2026 (Sun)

Running

Marathon Half-Marathon 10K

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

Centennial, Colorado, United States

Jun 6, 2026 (Sat) – Dec 12, 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

Jun 6, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

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

Centennial, Colorado, United States

May 23, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Run for Mental Health 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

May 23, 2026 (Sat) – Nov 14, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +14

8th Annual Angel Run at Red Leg Brewing

Colorado Springs, Colorado, United States

May 22, 2026 (Fri) – May 25, 2026

Running

5K 10K +2

Black Canyon Ascent

Montrose, Colorado, United States

May 16, 2026 (Sat)

Running, Walking

9.7K

Spirit Challenge Run for Autism 10k and 5k

Steamboat Springs, Colorado, United States

May 16, 2026 (Sat)

Running

10K 5K

Colorado Women's Classic - Westminster

Westminster, Colorado, United States

May 10, 2026 (Sun)

Running

5K 10K 16.1K