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Marathons Found In Colorado

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Marathons in Colorado 2025 - 2026

The most comprehensive list of Marathons in and near Colorado in 2025 - 2026. Find your perfect race!

Looking for more races to choose from? If you're in Colorado and want to take on a marathon challenge in neighboring states, look no further. Discover our calendars of:

You can also browse our comprehensive list of Marathons in the USA to find your next great challenge, or take a look at our calendar of half marathon races.

Race Calendar: Marathons Found In Colorado

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Sloan's Lake Search Party (SLSP) Marathon Hourly Loop Race!

Denver, Colorado
14 Sep 25
$75.20
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Singles & Friends Running Club 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
02 Aug 25
$32.80 - $48.70
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Slacker Half Marathon-Relay-4-Mile Races

Georgetown, Colorado
01 Jan 25 - 28 Jun 25
$38.10 - $128.20

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

Centennial, Colorado
14 Jun 25
$32.80 - $52.94

Father's Day Fun Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
14 Jun 25
$32.80 - $52.94

July 4th Freedom Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
05 Jul 25
$32.80 - $48.70

SuperHeroes Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
05 Jul 25
$32.80 - $48.70

Fleet Feet Denver Fall Half-Marathon Twelve-Week Training Program

Littleton, Colorado
08 Jul 25 - 28 Sep 25
$155.00

Run for Wine & Cheese 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
02 Aug 25
$32.80 - $48.70

Singles & Friends Running Club 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
02 Aug 25
$32.80 - $48.70

Labor Day Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
30 Aug 25
$32.80 - $48.70

Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
30 Aug 25
$32.80 - $48.70

National Chocolate Day: Run for Chocolates DENVER/AURORA

Centennial, Colorado
13 Sep 25
$32.80 - $48.70

Hedgehog Dash 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
13 Sep 25
$32.80 - $48.70

Beulah Challenge and OverIt Series

Beulah, Colorado
20 Sep 25
$18.25 - $187.25

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 - $48.70

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

Centennial, Colorado
04 Oct 25
$32.80 - $48.70

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

Louisville, Colorado
05 Oct 25
$32.80 - $105.94

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

Centennial, Colorado
18 Oct 25
$32.80 - $48.70

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

Centennial, Colorado
18 Oct 25
$32.80 - $48.70

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

Centennial, Colorado
01 Nov 25
$32.80 - $48.70

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

Centennial, Colorado
01 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

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

Centennial, Colorado
15 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

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

Centennial, Colorado
29 Nov 25
$32.80 - $48.70

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

Centennial, Colorado
13 Dec 25
$32.80 - $48.70

Run for Mental Health 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado
13 Dec 25
$32.80 - $48.70

Platte River Half-Marathon and Relay

Littleton, Colorado
13 Apr 25 - 12 Apr 26
$80.50 - $268.75

Platte River Half-Marathon and Relay

Littleton, Colorado
12 Apr 26
$75.20 - $165.30
Showing 1-30 of 30 results