10K races in Colorado, United States — 2026 running calendar

Jun

19

Treat Trot - Denver

Denver, Colorado, United States

$17.00 - $42.00

Running

Kids Dash 1.6K 5K 10K +3

Jun

20

Treat Trot Colorado Springs

Colorado Springs, Colorado, United States

$17.00 - $42.00

Running

Kids Dash 1.6K 5K 10K +3

Jun

24

Race in the Clouds - Alma Dirt Festival

Alma, Colorado, United States

Free - $90.00

Running Mountain biking Duathlon Trail running

Weekend Camping FREE Kids Mountain Bike and Trail Run Ultra Marathon +7

Jul

04

Let Freedom Run 5k/10k - Louisville

Louisville, Colorado, United States

Free - $45.00

Running

5K 10K Kids Fun Run - Free (approx 100 yards, untimed)

Jul

10

All-Out Dog Days

Westminster, Colorado, United States

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Jul

17

Summer Splash Prairie Dog Half, 10k, & 5k

Castle Rock, Colorado, United States

$35.00 - $75.00

Running

Half-Marathon 10K 5K

Jul

31

Popsicle 5K/10K/Half - Colorado Springs

Colorado Springs, Colorado, United States

$25.00 - $50.00

Running

5K 10K Half-Marathon +5

Aug

07

Eat. Run. Adopt. 10K

Berthoud, Colorado, United States

Running

10K

Aug

07

All-Out Runapalooza

Arvada, Colorado, United States

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Aug

07

Summer Sizzler- Denver

Denver, Colorado, United States

$17.00 - $42.00

Running

Kids Dash 1.6K 5K 10K +3

Aug

08

Summer Sizzler- Colorado Springs

Colorado Springs, Colorado, United States

$17.00 - $42.00

Running

Kids Dash 1.6K 5K 10K +3

Aug

29

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2