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Half Marathons Found In Colorado in September
View all ↓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
πBoosted
Red Feather Trail Jamboree
Red Feather Lakes, Colorado
26 Sep 25 - 28 Sep 25
$117.60 - $358.00
πBoosted
Fall Equinox
Fort Collins, Colorado
14 Sep 25 - 04 Oct 25
$65.65 - $269.50
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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
Autumn Run
Buena Vista, Colorado
20 Sep 25
$38.86 - $102.91
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 - $197.10
13th Annual Superhero Event
Greeley, Colorado
20 Sep 25 - 28 Sep 25
Free - $48.70
Beulah Challenge and OverIt Series
Beulah, Colorado
20 Sep 25
$18.25 - $213.75
Red Feather Trail Jamboree
Red Feather Lakes, Colorado
26 Sep 25 - 28 Sep 25
$117.60 - $358.00
National Singles Day: Singles & Friends Running DENVER/AURORA
Centennial, Colorado
27 Sep 25
$32.80 - $48.70
National Coffee Day: Run for Coffee DENVER/AURORA
Centennial, Colorado
27 Sep 25
$32.80 - $48.70
Pioneer Prairie Dog Half, 10k & 5k
Westminster, Colorado
27 Sep 25
Free - $85.00
WILD Wahatoya Runs
La Veta, Huerfano
27 Sep 25
$50.00 - $100.00
Prairie Dog Run Series
Louisville, Colorado
26 Jan 25 - 27 Sep 25
$900.00
Fleet Feet Denver Fall Half-Marathon Twelve-Week Training Program
Littleton, Colorado
08 Jul 25 - 28 Sep 25
$155.00
Boulderthon Half Marathon Training Program
Boulder, Colorado
09 Jul 25 - 28 Sep 25
$150.00
Fall Equinox
Fort Collins, Colorado
14 Sep 25 - 04 Oct 25
$65.65 - $269.50
Showing 1-16 of 16 results