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

I Can 5k

Thornton, Colorado, United States

03 Oct, 2026 (Sat)

Free

Running

5K +2

PRA Miner Gold Rush

Broomfield, Colorado, United States

03 Oct, 2026 (Sat)

$25.00 - $40.00

Running

5K 1.6K

Splashland Triathlon

Alamosa, Colorado, United States

03 Oct, 2026 (Sat)

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

OTILLO Swimrun Colorado

Fort Collins, Colorado, United States

04 Oct, 2026 (Sun)

Rubey Rescue Run

Aspen, Colorado, United States

04 Oct, 2026 (Sun)

$60.38

Trail running

5K

RMRR October Trophy Series

Aurora, Colorado, United States

04 Oct, 2026 (Sun)

$10.00

Running

12.9K 5K

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 - $110.00

Running

10K 5K 1.6K Marathon +1

The Long View Marathon

Fort Collins, Colorado, United States

10 Oct, 2026 (Sat)

$35.00 - $100.00

Running

Marathon Half-Marathon 5K

Suffer Better 10th Annual Fall Trail Runs

Pine, Colorado, United States

10 Oct, 2026 (Sat)

$25.00 - $90.00

Trail running

Ultra 25K 5K