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Half Marathons Found In Colorado in September

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Half Marathons in Colorado in September 2025

Find A Race is the US's favourite event listings site. Check out our list of September 2025 Half Marathons in Colorado below.

Race Calendar: Half Marathons Found In September

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Spooky Sprint - Denver

Littleton, Colorado
14 Sep 25
$18.83 - $48.28
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Trail Sisters Women's Half Marathon & 10k

Buena Vista, Colorado
13 Sep 25
$69.90 - $107.00
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Denver, CO Galloway Training Program

Denver, Colorado
20 Apr 24 - 05 Nov 25
$91.10 - $274.00

Fifty States Half Marathon Club General Membership

Colorado Springs, Colorado
02 May 24 - 02 Apr 34
$91.10

2025 Team CKF Running Series

Aspen, Colorado
22 Feb 25 - 30 Dec 25
Free

Fleet Feet Denver Fall Half-Marathon Twelve-Week Training Program

Littleton, Colorado
08 Jul 25 - 28 Sep 25
$155.00

Labor Day Half Marathon

Parker, Colorado
01 Sep 25
$34.40 - $77.60

Black Squirrel Half Marathon

Bellvue, Colorado
06 Sep 25
$107.00

All-Out Fall Fest

Westminster, Colorado
13 Sep 25
$32.80 - $69.90

Spooky Sprint - Colorado Springs

Colorado Springs, Colorado
13 Sep 25
$18.83 - $48.28

Trail Sisters Women's Half Marathon & 10k

Buena Vista, Colorado
13 Sep 25
$69.90 - $107.00

Fall Equinox

Fort Collins, Colorado
14 Sep 25 - 04 Oct 25
$65.65 - $140.03

Spooky Sprint - Denver

Littleton, Colorado
14 Sep 25
$18.83 - $48.28

Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon

Canon City, Colorado
20 Sep 25 - 07 Dec 25
Free - $186.50

13th Annual Superhero Event

Greeley, Colorado
20 Sep 25 - 28 Sep 25
Free - $38.10

Red Feather Trail Jamboree

Red Feather Lakes, Colorado
26 Sep 25 - 28 Sep 25
$96.40 - $295.00

Pioneer Prairie Dog Half, 10k & 5k

Westminster, Colorado
27 Sep 25
Free - $80.00

Prairie Dog Run Series

Louisville, Colorado
26 Jan 25 - 27 Sep 25
$900.00

Platte River Half-Marathon and Relay

Littleton, Colorado
13 Apr 25 - 12 Apr 26
$80.50 - $268.75

Autumn Run

Buena Vista, Colorado
20 Sep 25
$33.53 - $92.24
Showing 1-18 of 18 results