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

Sep

05

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

Denver, Colorado, United States

$22.00 - $85.00

Running

5K 10K Half-Marathon 1.6K

Sep

06

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

Colorado Springs, Colorado, United States

$22.00 - $72.00

Running

1.6K 5K 10K Half-Marathon

Sep

07

Labor Day Half Marathon

Parker, Colorado, United States

$36.00 - $80.00

Running

Half-Marathon 10K 5K

Sep

12

National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Sep

12

Black Squirrel Half Marathon

Bellvue, Colorado, United States

$110.00

Running

Half-Marathon

Sep

19

All-Out Fall Fest

Westminster, Colorado, United States

$35.00 - $80.00

Running

Half-Marathon 10K 5K +2

Sep

19

Autumn Run

Buena Vista, Colorado, United States

Free - $100.00

Running

Half-Marathon 10K 5K 1K

Sep

19

Beulah Challenge and OverIt Series

Beulah, Colorado, United States

$20.00 - $190.00

Running

Half-Marathon 10K 5K +2

Sep

20

Fall Equinox

Fort Collins, Colorado, United States

$75.00 - $85.00

Running

Half-Marathon 8K

Sep

26

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

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Sep

27

Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado

Boulder, Colorado, United States

$40.00 - $500.00

Running

Half-Marathon 5K 10K

Sep

27

Girls on the Run Rockies Boulderthon SoleMates

Boulder, Colorado, United States

$25.00

Running

Marathon Half-Marathon 10K