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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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Pioneer Prairie Dog Half, 10k & 5k

Westminster, Colorado
27 Sep 25
Free - $80.00
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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
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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 - 25 Oct 25
Free

Labor Day Half Marathon

Parker, Colorado
01 Sep 25
$34.40 - $77.60

Black Squirrel Half Marathon

Bellvue, Colorado
06 Sep 25
$107.00

Trail Sisters Women's Half Marathon & 10k

Buena Vista, Colorado
13 Sep 25
$69.90 - $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

Fall Equinox

Fort Collins, Colorado
14 Sep 25 - 04 Oct 25
$55.00 - $118.63

Spooky Sprint - Denver

Littleton, Colorado
14 Sep 25
$18.83 - $44.28

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

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

Autumn Run

Buena Vista, Colorado
20 Sep 25
$33.53 - $92.24
Showing 1-14 of 14 results