Marathon races in Colorado, United States — 2026 running calendar

Aspen Valley Marathon

Aspen, Colorado, United States

Jul 25, 2026 (Sat)

$100.00 - $260.00

Running

Marathon Half-Marathon 5K

Bound for Boston Marathon & Half Marathon - Denver

Denver, Colorado, United States

Aug 2, 2026 (Sun)

$45.00 - $95.00

Running

Marathon Half-Marathon

Staunton Rocks! Marathon and Half Marathon

Pine, Colorado, United States

Aug 22, 2026 (Sat)

$110.00 - $130.00

Running

Marathon Half-Marathon

Steele Trap Trail Run

Loma, Colorado, United States

Sep 12, 2026 (Sat)

$50.00

Running

Marathon

Pikes Peak Marathon

Manitou Springs, Colorado, United States

Sep 20, 2026 (Sun)

Free - $250.00

Running

Marathon

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

Colorado Springs, Colorado, United States

Oct 3, 2026 (Sat)

Free - $120.00

Running

Marathon Half-Marathon 5K 1K +11

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

Windsor, Colorado, United States

Oct 4, 2026 (Sun)

$20.00 - $115.00

Running

Marathon Half-Marathon 10K 5K +1

Breckenridge RunFest

Breckenridge, Colorado, United States

Oct 10, 2026 (Sat) – Oct 11, 2026

$25.00 - $120.00

Running

10K 5K 1.6K Marathon +1

The Long View Marathon

Fort Collins, Colorado, United States

Oct 10, 2026 (Sat)

$35.00 - $110.00

Running

Marathon Half-Marathon 5K

Durango Marathon

Durango, Colorado, United States

Oct 11, 2026 (Sun)

$30.00 - $165.00

Running

Marathon Half-Marathon 5K

22nd Annual Run Through Time Trail Marathon and Half Marathon

Salida, Colorado, United States

Mar 13, 2027 (Sat)

Trail running, Running

Marathon Half-Marathon 3.2K

The Colorado Marathon

Fort Collins, Colorado, United States

May 2, 2027 (Sun)

Running

Marathon Half-Marathon 5K 10K