Half-Marathon races in Colorado, United States — 2026 running calendar

Mar

27

Always Hope Easter Run Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Apr

04

Three Creeks Half Marathon

Englewood, Colorado, United States

$65.00 - $100.00

Running

Half-Marathon

Apr

07

Platte River Half-Marathon, Relay & 5k

Littleton, Colorado, United States

Running

Half-Marathon 5K

Apr

10

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

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Apr

10

Run for Pb&J 5k/10k/13.1 Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Apr

10

Run Through The Decades 6K/7K/8K/Half - Colorado Springs

Colorado Springs, Colorado, United States

$35.00 - $55.00

Running

6K 7K 8K Half-Marathon +4

Apr

11

Spring Fling Prairie Dog Half, 10k, & 5k

Arvada, Colorado, United States

$39.00 - $74.00

Running

Half-Marathon 10K 5K

Apr

18

Horsetooth Half Marathon - Presented by Fort Collins Connexion

Fort Collins, Colorado, United States

$95.00

Running

Half-Marathon

Apr

24

DoNot Stop Half Marathon/5K/10K - Colorado Springs

Colorado Springs, Colorado, United States

Free - $42.00

Running

Kid's Dash 1.6K 5K 10K +5

Apr

24

All-Out Beat the Heat

Westminster, Colorado, United States

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Apr

24

Run for Donut Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Apr

24

Bigfoot Half Marathon

Estes Park, Colorado, United States

$45.00 - $120.00

Running

Half-Marathon 5K