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Half Marathons Found In Colorado in Summer

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Half Marathons in Colorado in Summer 2025

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

Race Calendar: Half Marathons Found In Summer

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Rocky Mountain Half Marathon & 5K

Estes Park, Colorado
01 Aug 25 - 02 Aug 25
Free - $234.20
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Byers Peak Stampede Half Marathon & 5K Run

Fraser, Colorado
23 Aug 25
$54.00 - $75.20
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Fifty States Half Marathon Club General Membership

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

Slacker Half Marathon-Relay-4-Mile Races

Georgetown, Colorado
01 Jan 25 - 28 Jun 25
$2.06 - $128.20

2025 Team CKF Running Series

Aspen, Colorado
22 Feb 25 - 25 Oct 25
Free

2.2 for 22q Walk/Run/Ride 2025

Anywhere, Colorado
31 May 25 - 08 Jun 25
$24.32

Colorado 13er (Half Marathon/10k/5k)

Louisville, Colorado
01 Jun 25
$39.00 - $69.90

All-Out Summer Breeze

Arvada, Colorado
07 Jun 25
$43.40 - $80.50

Steamworks Half Marathon

Durango, Colorado
07 Jun 25
$84.74

Red, White and Brew 5k, 10k, Half Marathon & 12 Hour Last Person Standing

Windsor, Colorado
21 Jun 25
$16.90 - $122.90

Hometown Half Marathon & 5k/10k - Denver

Westminster, Colorado
21 Jun 25
$18.83 - $54.28

Hometown Half Marathon & 5k/10k - Colorado Springs

Colorado Springs, Colorado
22 Jun 25
$18.83 - $54.28

The Alma Foundation Race in the Clouds Dirt Festival

Alma, Colorado
10 Jul 25 - 13 Jul 25
Free - $133.50

All-Out Dog Days

Westminster, Colorado
12 Jul 25
$32.80 - $69.90

Aspen Valley Marathon

Aspen, Colorado
19 Jul 25
$70.15 - $213.25

Summer Splash Prairie Dog Half, 10k, & 5k

Castle Rock, Colorado
19 Jul 25
$40.00 - $80.00

Rocky Mountain Half Marathon & 5K

Estes Park, Colorado
01 Aug 25 - 02 Aug 25
Free - $234.20

Hero Hustle Colorado Springs

Colorado Springs, Colorado
02 Aug 25
$18.83 - $48.28

All-Out Runapalooza

Arvada, Colorado
02 Aug 25
$32.80 - $69.90

Sheep Mountain Trail Runs

Fairplay, Colorado
02 Aug 25
$96.40 - $181.20

Bound for Boston Marathon & Half Marathon - Denver

Denver, Colorado
03 Aug 25
$49.10 - $102.70

Erie Half & 5k

Erie, Colorado
17 Aug 25
$40.00 - $65.00

Byers Peak Stampede Half Marathon & 5K Run

Fraser, Colorado
23 Aug 25
$54.00 - $75.20

Arrowhead Half Marathon & 5K

Edwards, Eagle
23 Aug 25
$32.00 - $52.00

Staunton Rocks! Marathon and Half Marathon

Pine, Colorado
23 Aug 25
$107.00 - $128.20

TBK Bank Thirsty 13 Half Marathon

Durango, Colorado
23 Aug 25
$91.10 - $125.55

Prairie Dog Run Series

Louisville, Colorado
26 Jan 25 - 27 Sep 25
$900.00
Showing 1-25 of 25 results