Marathon races in Colorado, United States — 2026 running calendar

The Steamboat Marathon

Steamboat Springs, Colorado, United States

07 Jun, 2026 (Sun)

$85.00 - $170.00

Running

Marathon Half-Marathon 10K

Aspen Valley Marathon

Aspen, Colorado, United States

25 Jul, 2026 (Sat)

$80.00 - $240.00

Running

Marathon Half-Marathon 5K

Bound for Boston Marathon & Half Marathon - Denver

Denver, Colorado, United States

02 Aug, 2026 (Sun)

$45.00 - $95.00

Running

Marathon Half-Marathon

Staunton Rocks! Marathon and Half Marathon

Pine, Colorado, United States

22 Aug, 2026 (Sat)

$110.00 - $130.00

Running

Marathon Half-Marathon

Steele Trap Trail Run

Loma, Colorado, United States

12 Sep, 2026 (Sat)

$50.00

Running

Marathon

Pikes Peak Marathon

Manitou Springs, Colorado, United States

20 Sep, 2026 (Sun)

Free - $225.00

Running

Marathon

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

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

Breckenridge RunFest

Breckenridge, Colorado, United States

10 Oct, 2026 (Sat) – 11 Oct, 2026

$25.00 - $120.00

Running

10K 5K 1.6K Marathon +1

The Long View Marathon

Fort Collins, Colorado, United States

10 Oct, 2026 (Sat)

$35.00 - $110.00

Running

Marathon Half-Marathon 5K

Durango Marathon

Durango, Colorado, United States

11 Oct, 2026 (Sun)

$30.00 - $140.00

Running

Marathon Half-Marathon 5K

22nd Annual Run Through Time Trail Marathon and Half Marathon

Salida, Colorado, United States

13 Mar, 2027 (Sat)

Trail running, Running

Marathon Half-Marathon 3.2K