Half-Marathon 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

Platte River Half-Marathon, Relay & 5k

Littleton, Colorado, United States

Apr 7, 2027 (Wed) – Apr 11, 2027

Running

Half-Marathon 5K

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

Horsetooth Half Marathon - Presented by Fort Collins Connexion

Fort Collins, Colorado, United States

Apr 18, 2027 (Sun)

$75.00

Running

Half-Marathon

All-Out Beat the Heat

Westminster, Colorado, United States

Apr 24, 2027 (Sat)

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Bigfoot Half Marathon

Estes Park, Colorado, United States

Apr 24, 2027 (Sat)

$45.00 - $120.00

Running

Half-Marathon 5K

The Colorado Marathon

Fort Collins, Colorado, United States

May 2, 2027 (Sun)

Running

Marathon Half-Marathon 5K 10K

50 States Half Marathon Club General Membership

Colorado Springs, Colorado, United States

Feb 10, 2034 (Fri)

$85.00

Running

Half-Marathon

Fifty States Half Marathon Club Life Membership

Colorado Springs, Colorado, United States

Feb 11, 2034 (Sat)

$429.00

Running

Half-Marathon

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