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Half Marathons in Colorado

  1. Races by State
  2. Colorado
  3. Half Marathon

Browse Half 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 Half 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 Half Marathons in Colorado

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

OVERALL

(5 ratings)

4.8
Blue Sky Ascent & Round Trip (fka Mt Evans Ascent)
Idaho Springs, CO | Jun 28, 2026

OVERALL

(0 ratings)

0
ROCK-IT Run 5K & Half Marathon
Castle Rock, CO | Jul 4, 2026

OVERALL

(0 ratings)

0
Dog Days Half Marathon
Westminster, CO | Jul 11, 2026

OVERALL

(0 ratings)

0
Grin & Bear It Trail Run
Crested Butte, CO | Jul 11, 2026

OVERALL

(0 ratings)

0
Leadville Silver Rush 50 Run
Leadville, CO | Jul 11, 2026

OVERALL

(2 ratings)

5
Audi Power of Four Trail Run
Snowmass Village, CO | Jul 18, 2026

OVERALL

(0 ratings)

0
Summer Splash Prairie Dog Half Marathon Castle Rock
Castle Rock, CO | Jul 18, 2026

OVERALL

(3 ratings)

3.3
Grand Mesa Ultras
Cedaredge, CO | Jul 25, 2026

OVERALL

(0 ratings)

0
Pikes Peak Ultra
Colorado Springs, CO | Jul 25, 2026

OVERALL

(0 ratings)

0
Aspen Valley Marathon
Aspen, CO | Jul 26, 2026

OVERALL

(15 ratings)

3.8
Rocky Mountain Half Marathon 🏆
Estes Park, CO | Jul 31, 2026 – Aug 1, 2026

OVERALL

(129 ratings)

4.7
Aspen Backcountry
Aspen, CO | Aug 1, 2026

OVERALL

(1 rating)

5
Kennebec Mountain Run
Hesperus, CO | Aug 1, 2026

OVERALL

(0 ratings)

0
Popsicle Half, 10K & 5K
Colorado Springs, CO | Aug 1, 2026

OVERALL

(0 ratings)

0
Sheep Mountain Trail Runs
Fairplay, CO | Aug 1, 2026

OVERALL

(0 ratings)

0
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
All-Out Runapalooza
Arvada, CO | Aug 8, 2026

OVERALL

(1 rating)

4
Georgetown to Idaho Springs Half Marathon
Georgetown, CO | Aug 8, 2026

OVERALL

(11 ratings)

4.2

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