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Colorado Half Marathons

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Official Walker Friendly Half Marathons in Colorado

18:32 mile / 4 Hour Minimum course time limit= (W)

Symbol only applies to half marathon events

Trail Half Marathons (T)

Colorado Half Marathons 2026 & 2025

Does NOT meet the Walker Friendly 4 hour minimum (18:32 / mi) = Not Walker Friendly (NWF) 

Date
Colorado Half Marathons January 2026

Sat Jan 10, 2026 (W)

 

Sun Jan 18, 2026 (NWF)

Colorado Half Marathons February 2026

Sun Feb 8, 2026 (NWF)

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Sun Feb 22, 2026

 

Sun Feb 16, 2025  (W)

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Sat Feb 22, 2026

Location

Arvada, CO

 

Louisville, CO

Colorado Springs, CO

​

Colorado Springs, CO

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Arvada, CO

​

Arvada, CO

Colorado Half Marathons March 2026

Sun Mar 2, 2025 (NWF)

 

Sat Mar 14, 2026 (W)

 

Sun Mar 22, 2026 (W)

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Sun Mar 23, 2025 (NWF)

Greenwood Village, CO

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Salida, CO

 

Golden, CO

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Fort Collins, CO

Colorado Half Marathons April 2026

Sun Apr 13, 2025 (W)

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Sat Apr 12, 2025 (NWF)

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Sun Apr 19, 2026 (W)

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Sun Apr 13, 2025 (NWF)

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Sun Apr 13, 2025 (NWF)

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Sat Apr 18, 2026 (W)

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Sat Apr 25, 2026

Aurora, CO

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Boulder, CO

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Fort Collins, CO

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Arvada, CO

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Littleton, CO

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Westminster, CO

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Brighton, CO

Colorado Half Marathons May 2026

Sun May 3, 2026

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Sun May 4, 2025

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Sat May 10, 2025

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Sat May 9, 2026 (T)

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Sun May 10, 2026 (T)

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Sat May 16, 2026

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Sun May 17, 2026

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Sat May 31, 2025

Fort Collins, CO

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Longmont, CO

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Firestone, CO

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Colorado Springs, CO

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Highlands Ranch, CO

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Divide, CO

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Aurora, CO

​

Basalt, CO

Colorado Half Marathons June 2025

Sun Jun 1, 2025

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Sun Jun 7, 2026 (W)

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Sat Jun 7, 2025 (W)

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Sat Jun 7, 2025

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Sat Jun 7, 2025

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Sun Jun 8, 2025

 

Sun Jun 15, 2025 (W)

 

Sat Jun 28, 2025 (W)

Colorado Half Marathons July 2025

Louisville, CO

​

Steamboat Springs, CO

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Arvada, CO

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Durango, CO

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Towaoc, CO

​

Littleton, CO

 

Estes Park, CO

 

Georgetown, CO

Fri Jul 4, 2025

​

Sat Jul 12, 2025 (W)

 

Sat Jul 19, 2025

 

Sat Jul 19, 2025 (NWF)

Longmont, CO

​

Westminster, CO

 

Aspen, CO

 

Castle Rock, CO

Sat Aug 2, 2025

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Sat Aug 2, 2025 (W)

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Sat Aug 2, 2025

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Sun Aug 3, 2025 (T)

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Sat Aug 9, 2025

 

Sat Aug 9, 2025

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Sat Aug 16, 2025 (W)

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Sun Aug 17, 2025 (NWF)

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Sat Aug 23, 2025

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Sat Aug 23, 2025 (NWF)

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Sat Aug 23, 2025

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Sat Aug 23, 2025

Colorado Half Marathons August 2025

Estes Park, CO

​

Arvada, CO

​

Boulder, CO

​

Steamboat Springs, CO

​

Fort Collins, CO

 

Georgetown, CO

​

Ouray, CO

​

Erie, CO

​

Pine, CO

​

Durango, CO

​

Fraser, CO

​

Westminster, CO

Colorado Half Marathons September 2025

Mon Sep 1, 2025

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Sat Sep 6, 2025 (T)

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Sat Sep 13, 2025 (T)(NWF)

 

Sat Sep 13, 2025 (W)

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Sat Sep 13, 2025 (T)

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Sun Sep 14, 2025 (W)

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Sat Sep 20, 2025

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Sat Sep 27, 2025 (NWF)

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Sat Sep 27, 2025

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Sun Sep 28, 2025

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Sun Sep 28, 2025

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Tue Sep 30, 2025

Parker, CO

 

Fort Collins, CO

​

Nederland, CO

 

Buena Vista, CO

​

Granby, CO

​

Fort Collins, CO

​

Beulah, CO

​

Westminster, CO

​

Snowmass Village, CO

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Red Feather Lakes, CO

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Boulder, CO

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Sterling, CO

Sat Oct 4, 2025

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Sun Oct 5, 2025

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Sun Oct 5, 2025

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Sun Oct 5, 2025

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Sat Oct 11, 2025

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Sat Oct 11, 2025

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Sun Oct 12, 2025 (W)

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Sat Oct 18, 2025

Colorado Half Marathons October 2025

Colorado Springs, CO

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Fort Collins, CO

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Windsor, CO

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Morrison, CO

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Fort Collins, CO

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Breckenridge, CO

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Westminster, CO

​

Mancos, CO

Colorado Half Marathons November 2025

Sun Nov 2, 2025

​

Sat Nov 8, 2025 (T)

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Mon Nov 10, 2025 (W)

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Sat Nov 15, 2025

Golden, CO

​

Lone Tree, CO

​

Durango, CO

​

Louisville, CO

Colorado Half Marathons December 2025

Sat Dec 6, 2025 (W)

​

Sat Dec 6, 2025 (W)

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Sun Dec 7, 2025

Westminster, CO

​

Ute Mountain, CO

​

Pueblo, CO

Colorado Half Marathon Calendar event dates in grey are delinquent dates not updated by the race organizer yet. We strive to have dates 1 year out for Colorado half marathons, but have no control of when they set, announce or update their dates.

Colorado Half Marathons

The Colorado Half Marathon Calendar is a complete simplistic listing of half marathons in Colorado. Currently the Colorado half marathon schedule has 2025 Colorado half marathons and 2026 Colorado half marathons as they roll in. Colorado half marathons 2025 & Colorado half marathons 2026 also identify trail half marathons and walker friendly half marathons by a (T) symbol and a (W) symbol.  The (T) means it is a TRUE trail half marathon (off road, switchbacks, etc) and a (W) means it is truly "official walker friendly" requiring the half marathon to allow a minimum of 18:32 mile pace, minimum 4 hours for participants to finish the 13.1 mile distance.

 

The Colorado half marathon schedule of course features races such as Rock'n'Roll Denver Marathon and Rock'n'roll Denver Half marathon, along with a complete listing of Colorado half marathons, Denver half marathons, Ft. Collins half marathons, Colorado Springs half marathons, Boulder half marathons, Rocky Mountain half marathons, Vail half marathons, and many more half marathons in Colorado.

 

A half marathon is 13.1 miles (or in kilometers is a 21k). We understand sometimes there will be a slight margin of error up or down when runners run or walk any race distance, however our calendar only is a listing for true half marathons that do all they can to measure their course as an official half marathon 13.1 mile / 21k distance.  Races that are not 13.1 miles, we encourage not to call their race a 1/2 marathon to lessen confusion for runners & walkers looking to participate in a true 1/2 marathon distance. Some runners don't care, but you'd be surprised how many that do.

Colorado half marathons 2026

Colorado half marathons 2025

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