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

Oct

03

Colorado Springs Marathon, Half, 5K, and Kids K

Colorado Springs, Colorado, United States

Running

Marathon Half-Marathon 5K 1K +11

Sep

27

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

Boulder, Colorado, United States

Running

Half-Marathon 5K 10K

Sep

27

Girls on the Run Rockies Boulderthon SoleMates

Boulder, Colorado, United States

Running

Marathon Half-Marathon 10K

Sep

26

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Sep

20

Fall Equinox

Fort Collins, Colorado, United States

Running

Half-Marathon 8K

Sep

19

Beulah Challenge and OverIt Series

Beulah, Colorado, United States

Running

Half-Marathon 10K 5K +2

Sep

12

Black Squirrel Half Marathon

Bellvue, Colorado, United States

Running

Half-Marathon

Sep

12

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Aug

29

Run to Breast Cancer 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Aug

22

Staunton Rocks! Marathon and Half Marathon

Pine, Colorado, United States

Running

Marathon Half-Marathon

Aug

15

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Aug

15

Cookie Run 5K/10K/13.1 Denver/Aurora

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +8