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

Jul

10

All-Out Dog Days

Westminster, Colorado, United States

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Jul

17

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

Castle Rock, Colorado, United States

$35.00 - $75.00

Running

Half-Marathon 10K 5K

Jul

31

Popsicle 5K/10K/Half - Colorado Springs

Colorado Springs, Colorado, United States

$25.00 - $50.00

Running

5K 10K Half-Marathon +5

Aug

01

Bound for Boston Marathon & Half Marathon - Denver

Denver, Colorado, United States

Free - $75.00

Running

Marathon Half-Marathon Cheer Crew +1

Aug

07

All-Out Runapalooza

Arvada, Colorado, United States

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Aug

15

Erie Half & 5k

Erie, Colorado, United States

$35.00 - $60.00

Running

Half-Marathon 5K

Aug

21

Byers Peak Stampede Half Marathon & 5K Run

Fraser, Colorado, United States

$45.00 - $65.00

Running

Half-Marathon 4.8K

Aug

22

Pioneer Prairie Dog Half, 10k & 5k

Westminster, Colorado, United States

$39.00 - $74.00

Running

Half-Marathon 10K 5K

Aug

28

Tbk Bank Thirsty 13 Half Marathon

Durango, Colorado, United States

$89.00 - $124.00

Running

Half-Marathon

Sep

06

Labor Day Half Marathon

Parker, Colorado, United States

$30.00 - $70.00

Running

Half-Marathon 10K 5K

Sep

11

Golden Harvest Half Marathon & 5K/10K - Denver

Denver, Colorado, United States

Free - $55.00

Running

Kid's Dash 1.6K 5K 10K +4

Sep

12

Golden Harvest Half Marathon & 5K/10K - Colorado Springs

Colorado Springs, Colorado, United States

Free - $42.00

Running

Kid's Dash 1.6K 5K 10K +4