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 17, 2021 (NWF)
Colorado Half Marathons January 2021
Location
Arvada, CO
Louisville, CO
Colorado Half Marathons February 2021
Sat Feb 6, 2021 (W)
Sun Feb 7, 2021 (NWF)
Sun Feb 9, 2020 (W)
Sun Feb 28, 2021 (W)
Lakewood, CO
Colorado Springs, CO
Arvada, CO
Pueblo, CO
Colorado Half Marathons March 2021
Sun Mar 7, 2021 (NWF)
Sat Mar 14, 2020 (W)
Sun Mar 21, 2021 (W)
Sun Mar 21, 2021 (NWF)
Sun Mar 29, 2020 (W)
That Dam 13.1 & 5k Crush that Dam
Run Through Time Marathon, Half Marathon, 2-Mile
All-Out Spring Fever Half Marathon, 10k, 5k, 1 Mile
Greenwood Village, CO
Salida, CO
Golden, CO
Fort Collins, CO
Lamar, CO
Colorado Half Marathons April 2021
Sat Apr 3, 2021 (W)
Sun Apr 4, 2020 (W)
Sun Apr 5, 2020 (NWF)
Sat Apr 11, 2020
Sun Apr 11, 2021 (NWF)
Sat Apr 17, 2021 (W)
Sun Apr 18, 2021 (W)
Sun Apr 19, 2020 (T)
Sat Apr 25, 2020 (T)
Sat Apr 25, 2020
Sat Apr 25, 2020
Sun Apr 25, 2021
Runs with Scissors Half Marathon, Marathon, 50k
Platte River Half Marathon & Relay (3 hour time limit)
Hoppin' Half Marathon, 10k, 5k
Spring Time Prairie Dog Half Marathon (3.5 hour time limit)
All-Out Beat the Heat Marathon, Half Marathon, 10k, 5k, 1 Mile
Desert RATS Trail Running Festival Half Marathon (1600 elv gain), 10k
Westminster Trail Half Marathon, 10k, 5k
Rock Halk Trail Races 1/2 Marathon, 10k, 5k
Pueblo to Pueblo Run 1/2 Marathon, 5k 2020 Registration
Brighton, CO
Aurora, CO
Littleton, CO
Denver, CO
Arvada, CO
Westminster, CO
Fort Collins, CO
Fruita, CO
Westminster, CO
Castle Rock, CO
Cortez, CO
Boulder, CO
Colorado Half Marathons May 2021
Sat May 2, 2020
Sat May 9, 2020
Sun May 2, 2021
Sat May 10, 2020 (T)
Sat May 8, 2021
Sun May 16, 2021 (W)
Sat May 30, 2020 (NWF)
Sat May 29, 2021 (T)
Sun May 31, 2020
RunBlossom Half Marathon, 5k, 5mi
Grand Valley Marathon & Half Marathon
Colorado Marathon, Half Marathon, 5K & 10K
Desert RATS Rabbit Valley Half Marathon
Denver Colfax Marathon & Half Marathon
BBSC Boulder Rez Half Marathon, 10k, 5k & Relay
Valkyrie Trail Race 50k, Marathon Half Marathon, 4mi
Cannon City, CO
Palisade, CO
Ft Collins, CO
Fruita, CO
Firestone, CO
Aurora, CO
Boulder, CO
Colorado Springs, CO
Brighton, CO
Colorado Half Marathons June 2021
Sat Jun 6, 2020
Sun Jun 7, 2020
Sun Jun 5, 2021 (W)
Sun Jun 6, 2021 (W)
Sat Jun 6, 2020 (T)
Sat Jun 12, 2021 (NWF)
Sat Jun 6, 2020
Sat Jun 20, 2020
Sun Jun 21, 2020 (W)
Sun Jun 21, 2020
Sat Jun 20, 2020 (T)
Sat Jun 26, 2021 (W)
Sat Jun 27, 2020
Sat Jun 26, 2021 (W)
Sat Jun 27, 2020 (NWF)
Runoff Runoff Marathon, Half Marathon, & 6k
Revel Rockies Marathon & Half Marathon
Steamboat Marathon, Half Marathon & 10K
Steamworks Half Marathon 2021 Registration
Barr Lake Half Marathon and 10k
Estes Park Marathon, Half Marathon, 10k, 5k
Feat on the Street Father's Day Half Marathon, 10k, 5k
Mountain Ridge Trail Half Marathon & 10k
All Out Summer Breeze Half Marathon, 10k, 5k, 1 Mile
Creede, CO
Louisville, CO
Morrison, CO
Steamboat Springs, CO
Evergreen, CO
Durango, CO
Basalt, CO
Brighton, CO
Estes Park, CO
Denver, CO
Highlands Ranch, CO
Georgetown, CO
Mancos, CO
Arvada, CO
Boulder, CO
Colorado Half Marathons July 2021
Sun Jul 4, 2021
Sun Jul 5, 2020
Sat Jul 11, 2020
Sat Jul 17, 2021
Sat Jul 18, 2020 (W)
Sat Jul 18, 2020 (NWF)
Sun Jul 19, 2020 (T)
Sat Jul 25, 2020 (T)
Sat Jul 25, 2020 (NWF)
Mountain Madness Half Marathon and 10k
Sandcreek Half Marathon, 10k, 5k
Aspen Valley Marathon, Half Marathon, 5k
All-Out Dog Days Half Marathon, 10k, 5k, 1 mile
Summer Splash Prairie Dog Half Marathon
Black Hawk Trail Half Marathon & 10k
Living Journeys Synergy Athlete Half Marathon
Longmont, CO
Steamboat Springs, CO
Denver, CO
Aspen, CO
Westminster, CO
Castle Rock, CO
Golden, CO
Crested Butte, CO
Fort Collins, CO
Sat Aug 1, 2020
Sat Aug 1, 2020 (W)
Sun Aug 16, 2020 (T)
Sat Aug 8, 2020
Sun Aug 9, 2020 (T)
Sat Aug 21, 2021 (W)
Mon Aug 17, 2020 (W)
Sat Aug 22, 2020 (W)
Sat Aug 22, 2020
Sun Aug 23, 2020 (NWF)
Sat Aug 29, 2020 (NWF)
Sat Aug 29, 2020
Sat Sep 5, 2020
Mon Sep 7, 2020
Mon Sep 7, 2020
Sat Sep 12, 2020 (T)
Sat Sep 12, 2020 (T)
Sat Sep 12, 2020
Sun Sep 12, 2020
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)
Sat Sep 19, 2020
Sun Sep 20, 2020 (T)
Sat Sep 26, 2020 (W)
Sat Sep 13, 2020 (T)
Sun Sep 27, 2020
Colorado Half Marathons August 2020
Winter Park Half Marathon & 5k
Beaver Creek Half Marathon & 10k Trail Race
Georgetown to Idaho Springs Half Marathon
The Emerald Mountain Epic Marathon & Half Marathon
Center of the Nation Series Marathon, Half Marathon, 50/10/5k (day 1)
All-Out Runapalooza Half Marathon, 10k, 5k, 1 Mile
Ultrastream "Thirsty 13" Half Marathon
Colorado Half Marathons September 2020
Boulder Rez Marathon, 3/4 Marathon, Half Marathon, 10k, Relay
American Discovery Trail Marathon, Half Marathon
Labor Day Half Marathon, 10k, 5k
Ned * Ned Half Marathon, 10k, 5k
American Heroes Run Marathon, Half Marathon, 9.11mi, 5k & Ultras
Breckenridge Road Marathon, Half Marathon 2020 Registration
Mountain Ridge Trail Half Marathon & 10k
"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
Snow Mountain Ranch Trail Half Marathon, 10k, 5k
Colorado Springs Marathon & Half Marathon
Beulah Challenge Half Marathon, 10k, 5k Trail Run & Walk
Winter Park, CO
Estes Park, CO
Beaver Creek, CO
Georgetown, CO
Steamboat Springs, CO
Ouray, CO
Sterling, CO
Arvada, CO
Basalt, CO
Erie, CO
Durango, CO
Vail, CO
Boulder, CO
Colorado Springs, CO
Parker, CO
Fort Collins, CO
Nederland, CO
Longmont, CO
Breckenridge, CO
Highlands Ranch, CO
Westminster, CO
Buena Vista, CO
Fort Collins, CO
Westminster, CO
Snowmass, CO
Aurora, CO
Granby, CO
Colorado Springs, CO
Beulah, CO
Morrison, CO
Colorado Half Marathons October 2020
Sun Oct 4, 2020 (W)
Sat Oct 3, 2020
Sat Oct 3, 2020 (T)
Sat Oct 10, 2020
Sun Oct 11, 2020
Sun Oct 11, 2020
Sun Oct 18, 2020 (W)
Sun Oct 25, 2020 (W)
Sun Oct 25, 2020 (W)
Long View Marathon & Half Marathon 2020 Registration
Glenwood Canyon Shuffle Half Marathon, 5k 2020 Registration
Louisville Trail Half Marathon & 10k
Grand Valley Marathon & Half Marathon
Inaugural Boulderthon Downtown Edition 13.1 & 26.2
Run Through Time Marathon, Half Marathon, 2-Mile
Rock'n'Roll Denver Half Marathon
All-Out Kooky-Spooky Half Marathon, 10k, 5k, 1 Mile
Fort Collins, CO
Glenwood Springs, CO
Louisville, CO
Palisade, CO
Boulder, CO
Salida, CO
Denver, CO
Golden, CO
Westminster, CO
Sun Nov 1, 2020
Sat Nov 7, 2020
Sat Nov 6, 2021 (T)
Mon Nov 8, 2021 (W)
Rim Rock Marathon, Half Marathon, & Relay
HRCA Backcountry Wilderness Half Marathon 2021 Registration
Mainly Marathons Southwest Series 26.2mi, 13.1mi, 50/10/5k (day 2)
Louisville, CO
Fruita, CO
Highlands Ranch, CO
Durango, CO
Sat Dec 4, 2021 (W)
Sat Dec 5, 2020
Sun Dec 6, 2020 (T)
Westminster, CO
Unknown, 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.
The Colorado Half Marathon Calendar is a complete simplistic listing of half marathons in Colorado. Currently the Colorado half marathon schedule has 2021 Colorado half marathons and 2022 Colorado half marathons as they roll in. Colorado half marathons 2021 & Colorado half marathons 2022 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.