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Half Marathons Found In Colorado in Fall

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Half Marathons in Colorado in Fall 2025

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

Race Calendar: Half Marathons Found In Fall

πŸš€Boosted

National Singles Day: Singles & Friends Running DENVER/AURORA

Centennial, Colorado
27 Sep 25
$32.80 - $48.70
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Westy Half & 5k

Westminster, Colorado
12 Oct 25
$45.00 - $70.00
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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

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

WILD Wahatoya Runs

La Veta, Huerfano
27 Sep 25
$50.00 - $100.00

Pioneer Prairie Dog Half, 10k & 5k

Westminster, Colorado
27 Sep 25
Free - $85.00

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

Cheers to Oktoberfest Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
04 Oct 25
$32.80 - $52.94

Run for Donuts 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
04 Oct 25
$32.80 - $52.94

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 & 1 Mile Run

Windsor, Colorado
05 Oct 25
$20.00 - $135.00

Breckenridge Road Marathon

Breckenridge, Colorado
11 Oct 25
$33.73 - $147.14

The Long View Marathon

Fort Collins, Colorado
11 Oct 25
$48.70 - $128.20

Westy Half & 5k

Westminster, Colorado
12 Oct 25
$45.00 - $70.00

Run Against Breast Cancer 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
18 Oct 25
$32.80 - $52.94

Mancos Cowboy Half Marathon, 5K, and Fun Run

Mancos, Colorado
18 Oct 25
Free - $69.90

International Sloth Day Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
18 Oct 25
$32.80 - $52.94

Pedal 4 Possible: At the Raceway

Golden, Colorado
18 Oct 25
$54.00 - $128.20

Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
01 Nov 25
$32.80 - $52.94

Run DENVER/AURORA "The Mile High City" 5K/10K/13.1 FALL

Centennial, Colorado
01 Nov 25
$32.80 - $52.94

All-Out Kooky-Spooky

Golden, Colorado
02 Nov 25
$43.40 - $80.50

HRCA Backcountry Wilderness Half Marathon

Lone Tree, Colorado
08 Nov 25
$64.85

Bed to 5K/10K/13.1 Snoozers Run DENVER/AURORA

Centennial, Colorado
15 Nov 25
$32.80 - $48.70

Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
15 Nov 25
$32.80 - $48.70

10k Turkey Trek & 5k Turkey Trot - Now With HALF MARATHON DISTANCE!

Arvada, Colorado
22 Nov 25
$29.00 - $74.00

Thanksgiving Turkey Gobble Trot 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
29 Nov 25
$32.80 - $48.70

Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
29 Nov 25
$32.80 - $48.70

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

2025 Rim Rock Marathon and Half Marathon

Fruita, Mesa
02 Nov 25
$122.09 - $132.69
Showing 1-38 of 38 results