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

Christmas 5K/10K/Half Marathon in July Meet Up - Denver

Littleton, Colorado, United States

Jul 25, 2026 (Sat)

$35.00

Running

5K 10K Half-Marathon

Aspen Valley Marathon

Aspen, Colorado, United States

Jul 25, 2026 (Sat)

$100.00 - $260.00

Running

Marathon Half-Marathon 5K

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

Centennial, Colorado, United States

Jul 25, 2026 (Sat) – Sep 26, 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

Jul 25, 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

Aug 1, 2026 (Sat)

$35.00 - $60.00

Running

5K 10K Half-Marathon +5

Bound for Boston Marathon & Half Marathon - Denver

Denver, Colorado, United States

Aug 2, 2026 (Sun)

$45.00 - $95.00

Running

Marathon Half-Marathon

Choice City Running Festival

Fort Collins, Colorado, United States

Aug 7, 2026 (Fri) – Aug 8, 2026

Free - $78.00

Running

1.6K 5K 10K Half-Marathon +4

All-Out Runapalooza

Arvada, Colorado, United States

Aug 8, 2026 (Sat)

$40.00 - $353.00

Running

Half-Marathon 10K 5K +2

Bagel Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Aug 15, 2026 (Sat) – Oct 10, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Run for PB& J 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Aug 15, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Erie Half & 5k

Erie, Colorado, United States

Aug 16, 2026 (Sun)

$45.00 - $70.00

Running

Half-Marathon 5K

Byers Peak Stampede Half Marathon & 5K Run

Fraser, Colorado, United States

Aug 22, 2026 (Sat)

$65.00 - $85.00

Running

Half-Marathon 4.8K