5K races in Colorado, United States — 2026 running calendar

Parker Parks and Recreation So Long to Summer 5K/10K

Parker, Colorado, United States

26 Sep, 2026 (Sat)

$40.00 - $50.00

Running

5K 10K

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

Boulder, Colorado, United States

27 Sep, 2026 (Sun)

$40.00 - $500.00

Running

Half-Marathon 5K 10K

14er Fest 14K & 5K

Buena Vista, Colorado, United States

27 Sep, 2026 (Sun)

$35.00 - $50.00

Running

14K 5K

Joy & Justice 5k

Timnath, Colorado, United States

27 Sep, 2026 (Sun)

$15.00 - $40.00

Running, Walking

5K 1.6K

I Can 5k

Thornton, Colorado, United States

03 Oct, 2026 (Sat)

Free

Running

5K +2

Lafayette Music Fest -5K - 10K

Lafayette, Colorado, United States

03 Oct, 2026 (Sat)

$45.00 - $65.00

Running

10K 5K

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

Canon City, Colorado, United States

03 Oct, 2026 (Sat)

$40.00 - $80.00

Running

5K 12.9K Half-Marathon 10K +2

PRA Miner Gold Rush

Broomfield, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $40.00

Running

5K 1.6K

Spooky Sprint - Denver

Littleton, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $61.00

Running

1.6K 5K 10K Half-Marathon

Big Waves Family 5K run/walk Presented by Brumate

Westminster, Colorado, United States

03 Oct, 2026 (Sat)

$40.00

Running

5K

Homecoming 5K - Colorado State University

Fort Collins, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $30.00

Running

5K +1

Colorado Springs Marathon, Half, 5K, and Kids K

Colorado Springs, Colorado, United States

03 Oct, 2026 (Sat)

Free - $110.00

Running

Marathon Half-Marathon 5K 1K +11