Colorado Half Marathons
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)
Does NOT meet the Walker Friendly 4 hour minimum (18:32 / mi) = Not Walker Friendly (NWF)
Date
Sat Jan 9, 2021 (W)
Sun Jan 19, 2020 (NWF)
Colorado Half Marathons January 2021
Location
Arvada, CO
Louisville, CO
Colorado Half Marathons February 2021
Sun Feb 2, 2020 (NWF)
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Sat Feb 6, 2021 (W)
Sun Feb 9, 2020 (W)
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Sun Feb 21, 2021 (W)
Colorado Springs, CO
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Lakewood, CO
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Arvada, CO
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Pueblo, CO
Colorado Half Marathons March 2020
Sun Mar 7, 2021 (NWF)
Sat Mar 14, 2020 (W)
Sun Mar 22, 2020 (W)
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Sun Mar 22, 2020 (NWF)
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Sun Mar 29, 2020 (W)
That Dam 13.1 & 5k Crush that Dam
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Run Through Time Marathon, Half Marathon & 2-Mile
All-Out Spring Fever Half Marathon, 10k, 5k, 1 Mile
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Colorado Half Marathons April 2020
Sun Apr 4, 2020 (W)
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Sun Apr 5, 2020 (NWF)
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Sat Apr 11, 2020
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Sun Apr 12, 2020 (NWF)
Sat Apr 18, 2020 (W)
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Sun Apr 19, 2020 (W)
Sun Apr 19, 2020 (T)
Sat Apr 4, 2020 (W)
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Sat Apr 25, 2020 (T)
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Sat Apr 25, 2020
Sat Apr 25, 2020
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Platte River Half Marathon & Relay (3 hour time limit)
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Hoppin' Half Marathon, 10k, 5k
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Spring Time Prairie Dog Half Marathon (3.5 hour time limit)
All-Out Beat the Heat Marathon, Half Marathon, 10k, 5k, 1 Mile
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Desert RATS Trail Running Festival Half Marathon (1600 elv gain), 10k
Runs with Scissors Half Marathon, Marathon, 50k
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Westminster Trail Half Marathon, 10k, 5k
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Rock Halk Trail Races 1/2 Marathon, 10k, 5k
Greenwood Village, CO
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Salida, CO
Golden, CO
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Fort Collins, CO
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Lamar, CO
Aurora, CO
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Littleton, CO
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Denver, CO
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Arvada, CO
Westminster, CO
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Fort Collins, CO
Fruita, CO
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Brighton, CO
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Westminster, CO
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Castle Rock, CO
Cortez, CO
Colorado Half Marathons May 2020
Sat May 2, 2020
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Sat May 9, 2020
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Sun May 3, 2020
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Sat May 10, 2020 (T)
No 2019 Event
Sat May 9, 2020
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Sun May 17, 2020 (W)
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Sat May 30, 2020 (NWF)
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Sat May 30, 2020 (T)
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Sun May 31, 2020
RunBlossom Half Marathon, 5k, 5mi
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Grand Valley Marathon & Half Marathon
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Colorado Marathon, Half Marathon, 5K & 10K
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Desert RATS Rabbit Valley Half Marathon
Fear the Deer Trail 1/2 Marathon returning in 2020
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Denver Colfax Marathon & Half Marathon
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BBSC Boulder Rez Half Marathon, 10k, 5k & Relay
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Valkyrie Trail Race 50k, Marathon Half Marathon, 4mi
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Cannon City, CO
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Palisade, CO
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Ft Collins, CO
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Fruita, CO
Littleton, CO
Firestone, CO
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Aurora, CO
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Boulder, CO
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Colorado Springs, CO
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Brighton, CO
Colorado Half Marathons June 2020
Sat Jun 6, 2020
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Sun Jun 7, 2020
Sun Jun 7, 2020 (W)
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Sun Jun 2, 2019
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Sun Jun 6, 2020 (W)
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Sat Jun 6, 2020 (T)
Sat Jun 6, 2020 (NWF)
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Sat Jun 6, 2020
Sun Jun 21, 2020 (W)
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Sun Jun 21, 2020
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Sat Jun 20, 2020 (T)
Sat Jun 27, 2020 (W)
Sat Jun 27, 2020
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Sat Jun 27, 2020 (W)
Runoff Runoff Marathon, Half Marathon, & 6k
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Steamboat Marathon, Half Marathon & 10K
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Ute Mountain Ute Beardance Half, 10k, 5k 2019 Registration
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Revel Rockies Marathon & Half Marathon
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Estes Park Marathon, Half Marathon, 10k, 5k
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Feat on the Street Father's Day Half Marathon, 10k, 5k
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Mountain Ridge Trail Half Marathon & 10k
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Creede, CO
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Louisville, CO
Steamboat Springs, CO
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Towaoc, CO
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Morrison, CO
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Evergreen, CO
Durango, CO
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Basalt, CO
Estes Park, CO
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Denver, CO
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Highlands Ranch, CO
Georgetown, CO
Mancos, CO
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Arvada, CO
Colorado Half Marathons July 2020
Sat Jul 4, 2020
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Sun Jul 5, 2020
Sat Jul 11, 2020
Sat Jul 11, 2020
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Sat Jul 18, 2020 (W)
Sat Jul 18, 2020 (NWF)
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Sun Jul 19, 2020 (T)
Sat Jul 27, 2019 (T)
Sat Jul 25, 2020 (NWF)
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Mountain Madness Half Marathon and 10k
Sandcreek Half Marathon, 10k, 5k
Aspen Valley Marathon, Half Marathon, 5k
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All-Out Dog Days Half Marathon, 10k, 5k, 1 mile
Summer Splash Prairie Dog Half Marathon
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Black Hawk Trail Half Marathon & 10k
Living Journeys Synergy Athlete Half Marathon
Longmont, CO
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Steamboat Springs, CO
Denver, CO
Aspen, CO
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Westminster, CO
Castle Rock, CO
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Golden, CO
Crested Butte, CO
Fort Collins, CO
Sat Aug 1, 2020
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Sat Aug 1, 2020 (W)
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Sun Aug 16, 2020 (T)
Sat Aug 8, 2020
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Sun Aug 9, 2020 (T)
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Sat Aug 15, 2020 (W)
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Mon Aug 17, 2020 (W)
Sat Aug 22, 2020 (W)
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Sun Aug 23, 2020 (NWF)
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Sat Aug 29, 2020 (NWF)
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Sat Aug 29, 2020
Colorado Half Marathons August 2020
Winter Park Half Marathon & 5k
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Beaver Creek Half Marathon & 10k Trail Race
Georgetown to Idaho Springs Half Marathon
Steamboat Stinger Marathon & Half Marathon
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Center of the Nation Series Marathon, Half Marathon, 50/10/5k (day 1)
All-Out Runapalooza Half Marathon, 10k, 5k, 1 Mile
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Ultrastream "Thirsty 13" Half Marathon
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Winter Park, CO
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Estes Park, CO
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Beaver Creek, CO
Georgetown, CO
Steamboat Springs, CO
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Ouray, CO
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Sterling, CO
Arvada, CO
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Erie, CO
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Durango, CO
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Vail, CO
Colorado Half Marathons September 2020
Sat Sep 5, 2020
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Mon Sep 7, 2020
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Mon Sep 7, 2020
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Sat Sep 12, 2020 (T)
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Sat Sep 12, 2020 (T)
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Sat Sep 12, 2020
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Sun Sep 12, 2020
Sat Sep 19, 2020 (W)
Sat Sep 19, 2020 (W
Sun Sep 20, 2020 (W)
Sat Sep 19, 2020 (W)
Sat Sep 19, 2020 (T)
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Sat Sep 19, 2020
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Sun Sep 20, 2020 (T)
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Sat Sep 26, 2020 (W)
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Sat Sep 13, 2020 (T)
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Sun Sep 27, 2020
Boulder Rez Marathon, 3/4 Marathon, Half Marathon, 10k, Relay
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American Discovery Trail Marathon, Half Marathon
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Labor Day Half Marathon, 10k, 5k
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Ned * Ned Half Marathon, 10k, 5k
American Heroes Run Marathon, Half Marathon, 9.11mi, 5k & Ultras
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Breckenridge Road Marathon, Half Marathon 2020 Registration
"The Pioneer" Prairie Dog Half Marathon & 10k Westminster
Autumn Color Half Marathon, 10k, 5k
Equinox Half Marathon & 5 Mile
All-Out Fallfest Marathon, Half Marathon, 10k, 5k, 1 Mile
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Snow Mountain Ranch Trail Half Marathon, 10k, 5k
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Colorado Springs Marathon & Half Marathon
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Beulah Challenge Half Marathon, 10k, 5k Trail Run & Walk
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Colorado Half Marathons October 2020
Sun Oct 4, 2020 (W)
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Sat Oct 5, 2019
Sat Oct 3, 2020 (T)
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Sun Oct 11, 2020
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Sun Oct 13, 2019
Sun Oct 18, 2020 (W)
Sun Oct 25, 2020 (W)
Sun Oct 25, 2020 (W)
Long View Marathon & Half Marathon 2020 Registration
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Glenwood Canyon Shuffle Half Marathon, 5k 2019 Registration
Louisville Trail Half Marathon & 10k
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Inaugural Boulderthon Downtown Edition 13.1 & 26.2
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Broomfield Trails Marathon, Half Marathon, 10k, 5k
Rock'n'Roll Denver Half Marathon
All-Out Kooky-Spooky Half Marathon, 10k, 5k, 1 Mile
Boulder, CO
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Colorado Springs, CO
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Parker, CO
Fort Collins, CO
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Nederland, CO
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Longmont, CO
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Breckenridge, CO
Westminster, CO
Buena Vista, CO
Fort Collins, CO
Westminster, CO
Snowmass, CO
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Aurora, CO
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Granby, CO
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Colorado Springs, CO
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Beulah, CO
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Morrison, CO
Fort Collins, CO
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Glenwood Springs, CO
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Louisville, CO
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Boulder, CO
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Broomfield, CO
Denver, CO
Golden, CO
Westminster, CO
Colorado Half Marathons November 2020
Sat Nov 7, 2020
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Sat Nov 7, 2020 (T)
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Mon Nov 9, 2020 (W)
Rim Rock Marathon, Half Marathon, & Relay
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HRCA Backcountry Wilderness Half Marathon 2020 Registration
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Mainly Marathons Southwest Series 26.2mi, 13.1mi, 50/10/5k (day 2)
Fruita, CO
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Highlands Ranch, CO
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Durango, CO
Colorado Half Marathons December 2020
Sat Dec 5, 2020 (W)
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Sat Dec 5, 2020
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Sun Dec 6, 2020 (T)
All-Out Fa La La Half Marathon, 10k, 5k, 1 Mile
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Four Corners Quad Keyah Colorado Half Marathon
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Westminster, CO
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Unknown, CO
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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.
The Colorado Half Marathon Calendar is a complete simplistic listing of half marathons in Colorado. Currently the Colorado half marathon schedule has 2020 Colorado half marathons and 2021 Colorado half marathons as they roll in. Colorado half marathons 2020 & Colorado half marathons 2021 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.