Race Calendar in Colorado, United States

Buffalo Bicycle Classic

Boulder, Colorado, United States

13 Sep, 2026 (Sun)

$125.00 - $200.00

Cycling, Gravel biking

Ultra 22.5K +5

9/11 Heroes Run - Denver, Colorado

Denver, Colorado, United States

13 Sep, 2026 (Sun)

Free - $40.00

Running

5K 1.6K +3

Severance Glow 5K Run or Walk

Severance, Colorado, United States

18 Sep, 2026 (Fri)

$35.00

Running

5K

All-Out Fall Fest

Westminster, Colorado, United States

19 Sep, 2026 (Sat)

$25.00 - $70.00

Running

Half-Marathon 10K 5K +2

Salida Bike Fest - Salida 76 and the Banana Belt

Salida, Colorado, United States

19 Sep, 2026 (Sat) – 20 Sep, 2026

$125.00 - $165.00

Gravel biking, Mountain biking

Ultra

Battle by the Brook

Deckers, Colorado, United States

19 Sep, 2026 (Sat)

$89.00 - $104.00

Adventure race

32.2K 9.7K

Denver: Walk With Autism and Resource Fair

Denver, Colorado, United States

19 Sep, 2026 (Sat)

$25.00

Running

5K

Gummball 5K

Brighton, Colorado, United States

19 Sep, 2026 (Sat)

$30.00

Running

5K

Wellington STAR Foundation 5K 10K

Wellington, Colorado, United States

19 Sep, 2026 (Sat)

$10.00 - $50.00

Running

5K 10K +2

Miles 4 Madison 5K & 1K

Littleton, Colorado, United States

19 Sep, 2026 (Sat)

$25.00

Running

5K 1K

Lederhosen Race 2026

Red Feather Lakes, Colorado, United States

19 Sep, 2026 (Sat)

$35.00

Running

5.8K

Pikes Peak Ascent

Manitou Springs, Colorado, United States

19 Sep, 2026 (Sat)

Free - $200.00

Running

Half-Marathon