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

Jul

11

Heatwave Half Marathon - Denver

Littleton, Colorado, United States

Running

1.6K 5K 10K Half-Marathon +1

Jul

04

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

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

Jun

27

Slacker Half Marathon-Relay-4-Mile Races

Georgetown, Colorado, United States

Running

Half-Marathon 6.4K +3

Jun

20

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +8

Jun

20

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Jun

06

Run for Breast Cancer 5K/10K/13.1 Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Jun

06

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2

Jun

06

Steamworks Half Marathon

Durango, Colorado, United States

Running

Half-Marathon

May

23

Run for Mental Health 5K/10K/13.1 Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +14

May

23

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2