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 8, 2022 (W)
Sun Jan 17, 2021 (NWF)
Location
Arvada, CO
Louisville, CO
Sat Feb 6, 2021 (W)
Sun Feb 7, 2021 (NWF)
Sun Feb 21, 2021 (W)
Sun Feb 28, 2021 (W)
Lakewood, CO
Colorado Springs, CO
Arvada, CO
Pueblo, CO
Sun Mar 7, 2021 (NWF)
Tue Mar 9, 2021 (W)
Sat Mar 13, 2021 (W)
Sun Mar 21, 2021 (W)
Sun Mar 21, 2021 (NWF)
That Dam 13.1 & 5k Crush that Dam
MM DUSTBOWL Series (DAY 5) 13.1, 26.2, 50k, 10k, 5k
Run Through Time Marathon, Half Marathon, 2-Mile
All-Out Spring Fever Half Marathon, 10k, 5k, 1 Mile
Greenwood Village, CO
Lamar, CO
Salida, CO
Golden, CO
Fort Collins, CO
Sat Apr 3, 2021 (W)
Sun Apr 3, 2021 (W)
Sun Apr 11, 2021 (NWF)
Sat Apr 11, 2020
Sun Apr 11, 2021 (NWF)
Sat Apr 17, 2021 (W)
Sun Apr 18, 2021 (W)
Sun Apr 18, 2021 (T)
Sat Apr 24, 2021 (T)
Sat Apr 24, 2021
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
Sat May 1, 2021 (T)
Sat May 2, 2020
Sat May 9, 2020
Sun May 2, 2021
Sat May 8, 2021
Sun May 16, 2021 (W)
Sun May 23, 2021
Sat May 29, 2021 (T)
Desert RATS Rabbit Valley Half Marathon
RunBlossom Half Marathon, 5k, 5mi
Grand Valley Marathon & Half Marathon
Colorado Marathon, Half Marathon, 5K & 10K
Denver Colfax Marathon & Half Marathon
Barr Lake Half Marathon and 10k
Fruita, CO
Cannon City, CO
Palisade, CO
Ft Collins, CO
Firestone, CO
Aurora, CO
Brighton, CO
Colorado Springs, CO
Sat Jun 5, 2021
Sun Jun 5, 2021 (W)
Sat Jun 5, 2021 (T)
Sat Jun 6, 2020
Sun Jun 6, 2021 (W)
Sun Jun 6, 2021
Sun Jun 7, 2020
Sat Jun 12, 2021 (NWF)
Sat Jun 19, 2021 (T)
Sun Jun 20, 2021 (W)
Sun Jun 21, 2020
Sat Jun 26, 2021 (W)
Sat Jun 26, 2021 (W)
Sat Jun 27, 2020
Runoff Runoff Marathon, Half Marathon, & 6k
Revel Rockies Marathon & Half Marathon
Steamboat Marathon, Half Marathon & 10K
BBSC Boulder Rez Half Marathon, 10k, 5k & Relay
Steamworks Half Marathon 2021 Registration
Mountain Ridge Trail Half Marathon & 10k
Estes Park Marathon, Half Marathon, 10k, 5k
Feat on the Street Father's Day Half Marathon, 10k, 5k
All Out Summer Breeze Half Marathon, 10k, 5k, 1 Mile
Creede, CO
Morrison, CO
Evergreen, CO
Basalt, CO
Steamboat Springs, CO
Boulder, CO
Louisville, CO
Durango, CO
Highlands Ranch, CO
Estes Park, CO
Denver, CO
Georgetown, CO
Arvada, CO
Mancos, CO
Sun Jul 4, 2021
Sat Jul 11, 2020
Sat Jul 17, 2021
Sat Jul 17, 2021 (W)
Sat Jul 17, 2021 (NWF)
Sun Jul 18, 2021 (T)
Sat Jul 25, 2020 (T)
Sat Jul 25, 2020 (NWF)
Sat July 31, 2021
Sat July 31, 2021
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
Fort Collins Human Race 1/2 Marathon, 10k, 5k
Winter Park Half Marathon & 5k
Longmont, CO
Denver, CO
Aspen, CO
Westminster, CO
Castle Rock, CO
Golden, CO
Crested Butte, CO
Fort Collins, CO
Winter Park, CO
Estes Park, CO
Sun Aug 16, 2020 (T)
Sun Aug 8, 2021 (T)
Sat Aug 14, 2021
Sat Aug 14, 2021
Sat Aug 21, 2021 (W)
Sat Aug 21, 2021 (W)
Sat Aug 21, 2021
Sat Aug 22, 2020
Sun Aug 22, 2021 (NWF)
Sat Aug 28, 2021 (T)
Sat Aug 28, 2021 (NWF)
Mon Sep 7, 2020
Mon Sep 7, 2020
Sat Sep 11, 2021 (T)
Sat Sep 11, 2021 (T)
Sat Sep 12, 2020 (T)
Sun Sep 12, 2020
Mon Sep 13, 2021
Sat Sep 18, 2021 (W)
Sat Sep 18, 2021 (W)
Sat Sep 18, 2021 (W)
Sat Sep 18, 2021 (T)
Sat Sep 18, 2021 (T)
Sun Sep 19, 2021 (W)
Sat Sep 26, 2020 (W)
Sun Sep 26, 2021 (T)
Beaver Creek Half Marathon & 10k Trail Race
The Emerald Mountain Epic Marathon & Half Marathon
Georgetown to Idaho Springs Half Marathon
Boulder Rez Marathon, 3/4 Marathon, Half Marathon, 10k, Relay
All-Out Runapalooza Half Marathon, 10k, 5k, 1 Mile
Dynafit Half Marathon, 10k, 5k
Louisville Trail Half Marathon, 10k, 5k
American Discovery Trail Marathon, Half Marathon
Labor Day Half Marathon, 10k, 5k
Beulah Challenge Half Marathon, 10k, 5k Trail Run & Walk
Ned * Ned Half Marathon, 10k, 5k
Breckenridge Road Marathon, Half Marathon 2020 Registration
Center of the Nation Series Marathon, Half Marathon, 50/10/5k (day 1)
"The Pioneer" Prairie Dog Half Marathon & 10k Westminster
Autumn Color Half Marathon, 10k, 5k
All-Out Fallfest Marathon, Half Marathon, 10k, 5k, 1 Mile
Snow Mountain Ranch Trail Half Marathon, 10k, 5k
Equinox Half Marathon & 5 Mile
Colorado Springs Marathon & Half Marathon
Beaver Creek, CO
Steamboat Springs, CO
Georgetown, CO
Boulder, CO
Ouray, CO
Arvada, CO
Vail, CO
Basalt, CO
Erie, CO
Louisville, CO
Durango, CO
Colorado Springs, CO
Parker, CO
Fort Collins, CO
Beulah, CO
Nederland, CO
Breckenridge, CO
Sterling, CO
Westminster, CO
Buena Vista, CO
Westminster, CO
Snowmass, CO
Granby, CO
Fort Collins, CO
Colorado Springs, CO
Morrison, CO
Sun Oct 3, 2021 (W)
Sat Oct 10, 2020
Sun Oct 18, 2020 (W)
Sun Oct 24, 2021 (W)
Sun Oct 31, 2021 (W)
Long View Marathon & Half Marathon 2021 Registration
Grand Valley Marathon & Half Marathon
Rock'n'Roll Denver Half Marathon
Sun Nov 1, 2020
Sat Nov 6, 2021
Sat Nov 6, 2021 (T)
Sun Nov 14, 2021 (W)
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)
Fort Collins, CO
Palisade, CO
Denver, CO
Westminster, CO
Golden, CO
Louisville, CO
Fruita, CO
Highlands Ranch, CO
Fort Collins, 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.