0016

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

πŸš€Boosted

Red Feather Trail Jamboree

Red Feather Lakes, Colorado
26 Sep 25 - 28 Sep 25
$117.60 - $358.00
πŸš€Boosted

Fall Equinox

Fort Collins, Colorado
14 Sep 25 - 04 Oct 25
$65.65 - $269.50
Feature your event at the top of the results

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