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Marathons in Colorado

  1. Races by State
  2. Colorado
  3. Marathon

Browse Marathon races in Colorado, including upcoming races and races up to one year past their event date. Sort by highest rating or number of reviews to elevate the most popular races.

For each Marathon race, you’ll find key details, finisher ratings and reviews, photos, videos, related articles, race-day weather data and a link to register.

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Showing Marathons in Colorado

Spirit Trail Race
Buena Vista, CO | May 25, 2025

OVERALL

(0 ratings)

0
Steamboat Marathon, Half Marathon & 10K
Steamboat Springs, CO | Jun 1, 2025

OVERALL

(7 ratings)

4.4
Estes Park Marathon
Estes Park, CO | Jun 14–15, 2025

OVERALL

(3 ratings)

4
Leadville Trail Marathon & Heavy Half
Leadville, CO | Jun 28, 2025

OVERALL

(3 ratings)

4.7
Aspen Valley Marathon
Aspen, CO | Jul 19, 2025

OVERALL

(14 ratings)

3.8
Silverton Alpine Marathon & 50K
Silverton, CO | Jul 19, 2025

OVERALL

(3 ratings)

4.3
Boulder Rez Marathon
Boulder, CO | Aug 2, 2025

OVERALL

(3 ratings)

4.3
Emerald Mountain Epic
Steamboat Springs, CO | Aug 3, 2025

OVERALL

(1 rating)

5
Staunton Rocks! Marathon & Half
Conifer, CO | Aug 23, 2025

OVERALL

(0 ratings)

0
American Heroes Run
Longmont, CO | Sep 5–6, 2025

OVERALL

(1 rating)

4
Sundance to Spearfish Marathon
Beulah, SD | Sep 7, 2025

OVERALL

(6 ratings)

5
Fall Equinox Marathon, Half Marathon & 5 Mile
Bellvue, CO | Sep 14, 2025

OVERALL

(6 ratings)

4.8
Pikes Peak Marathon and Ascent
Manitou Springs, CO | Sep 20–21, 2025

OVERALL

(19 ratings)

4.6
Boulderthon
Boulder, CO | Sep 28, 2025

OVERALL

(9 ratings)

3.3
Mainly Marathons Center of the Nation Series Day 2 (CO)
Sterling, CO | Sep 30, 2025

OVERALL

(1 rating)

5
Colorado Springs Marathon
Colorado Springs, CO | Oct 4, 2025

OVERALL

(11 ratings)

4.3
Windsor Marathon, Half Marathon, 10K & 5K (CO)
Windsor, CO | Oct 5, 2025

OVERALL

(0 ratings)

0
Breckenridge Road Marathon
Breckenridge, CO | Oct 11, 2025

OVERALL

(2 ratings)

5
Long View Marathon, Half Marathon & 5K
Fort Collins, CO | Oct 11, 2025

OVERALL

(2 ratings)

3.5
Blue Sky Trail Marathon & Half Marathon
Fort Collins, CO | Oct 18–19, 2025

OVERALL

(0 ratings)

0

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