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

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

Centennial, Colorado, United States

04 Jul, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Heatwave Half Marathon - Denver

Littleton, Colorado, United States

11 Jul, 2026 (Sat)

$22.00 - $73.00

Running

1.6K 5K 10K Half-Marathon +1

All-Out Dog Days

Westminster, Colorado, United States

11 Jul, 2026 (Sat)

$35.00 - $80.00

Running

Half-Marathon 10K 5K +2

Heatwave Half Marathon - Colorado Springs

Colorado Springs, Colorado, United States

12 Jul, 2026 (Sun)

$22.00 - $60.00

Running

1.6K 5K 10K Half-Marathon +1

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

Castle Rock, Colorado, United States

18 Jul, 2026 (Sat)

$45.00 - $85.00

Running

Half-Marathon 10K 5K

Aspen Valley Marathon

Aspen, Colorado, United States

25 Jul, 2026 (Sat)

$80.00 - $240.00

Running

Marathon Half-Marathon 5K

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

Centennial, Colorado, United States

25 Jul, 2026 (Sat) – 26 Sep, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

25 Jul, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Popsicle 5K/10K/Half - Colorado Springs

Colorado Springs, Colorado, United States

01 Aug, 2026 (Sat)

$35.00 - $60.00

Running

5K 10K Half-Marathon +5

Bound for Boston Marathon & Half Marathon - Denver

Denver, Colorado, United States

02 Aug, 2026 (Sun)

$45.00 - $95.00

Running

Marathon Half-Marathon

Choice City Running Festival

Fort Collins, Colorado, United States

07 Aug, 2026 (Fri) – 08 Aug, 2026

Free - $71.00

Running

1.6K 5K 10K Half-Marathon +4

All-Out Runapalooza

Arvada, Colorado, United States

08 Aug, 2026 (Sat)

$40.00 - $353.00

Running

Half-Marathon 10K 5K +2