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

Aug

07

Choice City Running Festival

Fort Collins, Colorado, United States

Running Walking

1.6K 5K 10K Half-Marathon +7

Jul

25

Aspen Valley Marathon

Aspen, Colorado, United States

Running

Marathon Half-Marathon 5K

Jul

25

Run for Donuts 5K/10K/13.1 Denver/Aurora

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +8

Jul

25

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

Littleton, Colorado, United States

Running

5K 10K Half-Marathon

Jul

25

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Jul

12

Heatwave Half Marathon - Colorado Springs

Colorado Springs, Colorado, United States

Running

1.6K 5K 10K Half-Marathon +1

Jul

11

Heatwave Half Marathon - Denver

Littleton, Colorado, United States

Running

1.6K 5K 10K Half-Marathon +1

Jul

04

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Jul

04

6th Annual July 4th Rock-It Run

Castle Rock, Colorado, United States

Running

5K Half-Marathon 1K

Jul

04

July 4th Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Jun

20

Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Jun

20

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +8