Running Race Calendar in Colorado, United States

Lafayette Music Fest -5K - 10K

Lafayette, Colorado, United States

03 Oct, 2026 (Sat)

$45.00 - $65.00

Running

10K 5K

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

Emerald Mountain Trail Run

Steamboat Springs, Colorado, United States

03 Oct, 2026 (Sat)

$25.75 - $40.75

Running

12K 6.4K

Homecoming 5K - Colorado State University

Fort Collins, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $30.00

Running

5K +1

I Can 5k

Thornton, Colorado, United States

03 Oct, 2026 (Sat)

Free

Running

5K +2

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

Spooky Sprint - Denver

Littleton, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $61.00

Running

1.6K 5K 10K Half-Marathon

PRA Miner Gold Rush

Broomfield, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $40.00

Running

5K 1.6K

RMRR October Trophy Series

Aurora, Colorado, United States

04 Oct, 2026 (Sun)

$10.00

Running

12.9K 5K

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

Windsor, Colorado, United States

04 Oct, 2026 (Sun)

$20.00 - $115.00

Running

Marathon Half-Marathon 10K 5K +1

Dialysis Dash 5K

Grand Junction, Colorado, United States

10 Oct, 2026 (Sat)

$20.00

Running

5K

Breckenridge RunFest

Breckenridge, Colorado, United States

10 Oct, 2026 (Sat) – 11 Oct, 2026

$25.00 - $120.00

Running

10K 5K 1.6K Marathon +1