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

Lucky Brew Race 5K, 10K, 15k & Half Marathon

Severance, Colorado, United States

Mar 14, 2027 (Sun)

$15.00 - $70.00

Running

5K 10K 15K 1K +1

All-Out Spring Fever

Golden, Colorado, United States

Mar 21, 2027 (Sun)

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Run for Bagels 5K/10K/13.1 Denver/Aurora

Centennial, Colorado, United States

Apr 10, 2027 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

All-Out Beat the Heat

Westminster, Colorado, United States

Apr 24, 2027 (Sat)

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

The Colorado Marathon

Fort Collins, Colorado, United States

May 2, 2027 (Sun)

Running

Marathon Half-Marathon 5K 10K

Summer Splash Prairie Dog Half, 10k, & 5k

Castle Rock, Colorado, United States

Jul 18, 2026 (Sat)

Running

Half-Marathon 10K 5K

Heatwave Half Marathon - Colorado Springs

Colorado Springs, Colorado, United States

Jul 12, 2026 (Sun)

Running

1.6K 5K 10K Half-Marathon +1

Heatwave Half Marathon - Denver

Littleton, Colorado, United States

Jul 11, 2026 (Sat)

Running

1.6K 5K 10K Half-Marathon +1

All-Out Dog Days

Westminster, Colorado, United States

Jul 11, 2026 (Sat)

Running

Half-Marathon 10K 5K +2

July 4th Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Jul 4, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

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

Centennial, Colorado, United States

Jul 4, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Let Freedom Run 5k/10k - Louisville

Louisville, Colorado, United States

Jul 4, 2026 (Sat)

Running

5K 10K