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

Platte River Half-Marathon, Relay & 5k

Littleton, Colorado, United States

07 Apr, 2027 (Wed) – 11 Apr, 2027

Running

Half-Marathon 5K

All-Out Beat the Heat

Westminster, Colorado, United States

24 Apr, 2027 (Sat)

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

The Colorado Marathon

Fort Collins, Colorado, United States

02 May, 2027 (Sun)

Running

Marathon Half-Marathon 5K 10K

50 States Half Marathon Club General Membership

Colorado Springs, Colorado, United States

10 Feb, 2034 (Fri)

$85.00

Running

Half-Marathon

Fifty States Half Marathon Club Life Membership

Colorado Springs, Colorado, United States

11 Feb, 2034 (Sat)

$429.00

Running

Half-Marathon

Run for Mental Health 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

23 May, 2026 (Sat) – 14 Nov, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +14

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

Centennial, Colorado, United States

23 May, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Girls on the Run Rockies Colfax SoleMates 2026

Denver, Colorado, United States

17 May, 2026 (Sun)

Running

Marathon Half-Marathon

Hometown Half Marathon & 5k/10k - Denver

Littleton, Colorado, United States

10 May, 2026 (Sun)

Running

1.6K 5K 10K Half-Marathon +1

Super Mom 5K/10K/Half - Colorado Springs

Colorado Springs, Colorado, United States

10 May, 2026 (Sun)

Running

5K 10K Half-Marathon +5

Hometown Half Marathon & 5k/10k - Colorado Springs

Colorado Springs, Colorado, United States

09 May, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Longmont Half & 5k (LM Half)

Longmont, Colorado, United States

03 May, 2026 (Sun)

Running

Half-Marathon 5K