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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

Leadville Trail Marathon & Heavy Half
Leadville, CO | Jun 27, 2026

OVERALL

(5 ratings)

4.8
Silverton Alpine 50K & Marathon
Silverton, CO | Jul 18, 2026

OVERALL

(3 ratings)

4.3
Aspen Valley Marathon
Aspen, CO | Jul 26, 2026

OVERALL

(15 ratings)

3.8
Aspen Backcountry
Aspen, CO | Aug 1, 2026

OVERALL

(1 rating)

5
Bound for Boston Marathon Denver
Denver, CO | Aug 2, 2026

OVERALL

(0 ratings)

0
I’m Bound for Boston Marathon (CO)
Denver, CO | Aug 2, 2026

OVERALL

(0 ratings)

0
Emerald Mountain Epic
Steamboat Springs, CO | Aug 9, 2026

OVERALL

(2 ratings)

3.5
Boulder Rez Marathon
Boulder, CO | Aug 15, 2026

OVERALL

(4 ratings)

4.5
Staunton Rocks! Marathon & Half
Conifer, CO | Aug 22, 2026

OVERALL

(0 ratings)

0
American Heroes Run
Longmont, CO | Sep 11–12, 2026

OVERALL

(1 rating)

4
Pikes Peak Marathon and Ascent
Manitou Springs, CO | Sep 19–20, 2026

OVERALL

(20 ratings)

4.6
Boulderthon
Boulder, CO | Sep 27, 2026

OVERALL

(13 ratings)

3.6
Mainly Marathons Center of the Nation Series Day 2 (CO)
Sterling, CO | Sep 29, 2026

OVERALL

(1 rating)

5
Colorado Springs Marathon
Colorado Springs, CO | Oct 3, 2026

OVERALL

(14 ratings)

4.1
West Elk Challenge
Crawford, CO | Oct 4, 2026

OVERALL

(0 ratings)

0
Windsor Marathon, Half Marathon, 10K & 5K (CO)
Windsor, CO | Oct 4, 2026

OVERALL

(0 ratings)

0
Breckenridge Road Marathon & RunFest
Breckenridge, CO | Oct 10–11, 2026

OVERALL

(3 ratings)

5
Long View Marathon, Half Marathon & 5K
Fort Collins, CO | Oct 10, 2026

OVERALL

(3 ratings)

2.7
Durango Marathon
Durango, CO | Oct 11, 2026

OVERALL

(0 ratings)

0
Blue Sky Trail Marathon & Half Marathon
Fort Collins, CO | Oct 17–18, 2026

OVERALL

(0 ratings)

0

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