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

Sep

18

All-Out Fall Fest

Westminster, Colorado, United States

$20.00 - $65.00

Running

Half-Marathon 10K 5K +2

Sep

18

Autumn Run

Buena Vista, Colorado, United States

Free - $95.00

Running

Half-Marathon 10K 5K Family Fun Run

Oct

02

Spooky Sprint - Denver

Denver, Colorado, United States

Free - $52.00

Running

Kids Dash 1.6K 5K 10K +4

Oct

11

Your Story Isn't Over 5k/10k/Kids 1-Mile

Littleton, Colorado, United States

Running

1.6K 10K 5K

Oct

10

Breckenridge RunFest

Breckenridge, Colorado, United States

Running

10K 5K 1.6K Marathon +1

Oct

10

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

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Oct

04

Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run

Windsor, Colorado, United States

Running

Marathon Half-Marathon 10K 5K +1

Oct

03

Lafayette Music Fest -5K - 10K

Lafayette, Colorado, United States

Running

10K 5K

Oct

03

Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon

Canon City, Colorado, United States

Running

5K 12.9K Half-Marathon 10K +2

Sep

27

Girls on the Run Rockies Boulderthon SoleMates

Boulder, Colorado, United States

Running

Marathon Half-Marathon 10K

Sep

27

Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado

Boulder, Colorado, United States

Running

Half-Marathon 5K 10K

Sep

26

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

Centennial, Colorado, United States

Running

5K 10K Half-Marathon 1.6K +2