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Half Marathons Found In Colorado in October

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Half Marathons in Colorado in October 2025

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

Race Calendar: Half Marathons Found In October

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Blue Sky Trail Marathon & Half Marathon

Fort Collins, Colorado
18 Oct 25 - 19 Oct 25
$107.00 - $128.20
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Fifty States Half Marathon Club General Membership

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

Fall Equinox

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

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

Colorado Springs Marathon, Half, 5K, and Kids K

Colorado Springs, Colorado
04 Oct 25 - 05 Oct 25
Free - $535.35

Layafette Music Fest Half-Marathon/10K/5K

Louisville, Colorado
05 Oct 25
$32.80 - $105.94

Windsor Marathon, Half Marathon, 10k & 5k

Windsor, Colorado
05 Oct 25
$15.00 - $120.00

Breckenridge Road Marathon

Breckenridge, Colorado
11 Oct 25
$20.12 - $110.85

The Long View Marathon

Fort Collins, Colorado
11 Oct 25
$38.10 - $107.00

Westy Half & 5k

Westminster, Colorado
12 Oct 25
$40.00 - $65.00

Blue Sky Trail Marathon & Half Marathon

Fort Collins, Colorado
18 Oct 25 - 19 Oct 25
$107.00 - $128.20
Showing 1-11 of 11 results