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

Feb

13

Valentine's Day Run 5K/10K/13.1 Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Feb

14

Ralston Creek Half Marathon & 5k

Arvada, Colorado, United States

$25.00 - $140.00

Running

Half-Marathon 5K +1

Feb

14

The Toyota Super Half Marathon™& Game Day 5K™

Colorado Springs, Colorado, United States

$35.00 - $70.00

Running

Half-Marathon 5K

Feb

27

Run For Mental Health Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Feb

27

Run Together Against Breast Cancer Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Mar

06

Time to Paddy 5K/10K & Lucky 13.1 13.1 - Denver

Denver, Colorado, United States

Free - $61.00

Running

Kid's Dash 1.6K 5K 10K +4

Mar

07

Time to Paddy 5K/10K & Lucky 13.1 - Colorado Springs

Colorado Springs, Colorado, United States

Free - $48.00

Running

Kid's Dash 1.6K 5K 10K +4

Mar

13

22nd Annual Run Through Time Trail Marathon and Half Marathon

Salida, Colorado, United States

Trail running Running

Marathon Half-Marathon 3.2K

Mar

14

Lucky Brew Race 5K, 10K, 15k & Half Marathon

Severance, Colorado, United States

$20.00 - $80.00

Running

5K 10K 15K 1K +1

Mar

20

St. Paddy's Day Lucky Run 5K/10K/13.1 Denver/Aurora

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Mar

21

Spring Equinox

Wellington, Colorado, United States

$25.00 - $75.00

Running

Half-Marathon 5K

Mar

21

All-Out Spring Fever

Golden, Colorado, United States

$25.00 - $70.00

Running

Half-Marathon 10K 5K +2