Browse all 2017-2018 Colorado half marathons by month below. For each race, you’ll find course maps, elevation profiles, runner reviews, and how to sign up.
See also: Colorado Half Marathons, Listed by City
January 2018
- Sat, Jan 13: All-Out Polar Prowl Half Marathon, 10K & 5K in Arvada, CO
- Sun, Jan 14: Prairie Dog Half Marathon & 10K in Louisville, CO
February 2018
- Sun, Feb 4: Super Half Marathon & 5K in Colorado Springs, CO
- Sat, Feb 10: All-Out Mardi Crawl Half Marathon, 10K, 5K & 1 Mile in Lakewood, CO
- Sun, Feb 18: Ralston Creek Half Marathon & 5K in Arvada, CO
- Sun, Feb 25: Pueblo Marathon & Half Marathon in Pueblo, CO
March 2018
- Sun, Mar 4: That Dam 13.1 & 5K Crush That Dam in Greenwood Village, CO
- Sun, Mar 18: All-Out Spring Fever Half Marathon, 10K, 5K & 1-Mile in Golden, CO
- Sat, Mar 31: Dust Bowl Series Marathon, Half Marathon, 10K & 5K – Day 1 in Lamar, CO
- Sat, Mar 31: Hoppin’ Half Marathon, 10K & 5K in Denver, CO
April 2018
- Sun, Apr 8: Spring Fling Prairie Dog Half Marathon, 10K & 5K in Arvada, CO
- Sat, Apr 14: All-Out Beat the Heat Marathon, Half Marathon, 10K, 5K & 1-Mile in Westminster, CO
- Sun, Apr 15: Horsetooth Half Marathon in Fort Collins, CO
May 2018
- Sun, May 6: Colorado Marathon, Half Marathon, 5K & 10K in Fort Collins, CO
- Sat, May 12: Rabbit Valley Half Marathon in Fruita, CO
- Sat, May 19: Mine Shaft Half in Golden, CO
- Sun, May 20: Colfax Marathon, Half Marathon, Relay & Urban 10-Miler in Denver, CO
June 2018
- Sat, Jun 2: Run the Rockies Half Marathon & 10K in Frisco, CO
- Sun, Jun 3: Revel Rockies Marathon & Half Marathon in Evergreen, CO
- Sun, Jun 3: Skirt Sport 13er Half Marathon, 10K & 5K in Louisville, CO
- Sun, Jun 3: Steamboat Marathon, Half Marathon & 10K in Steamboat Springs, CO
- Sat, Jun 9: Runoff Runoff Marathon, Half Marathon & 6K in Creede, CO
- Sat, Jun 9: South Park Trail Marathon & Half Marathon in Fairplay, CO
- Sat, Jun 16: All-Out Summer Breeze Half Marathon, 10K, 5K & 1 Mile in Arvada, CO
- Sat, Jun 16: Eagle Half Marathon & 10K in Eagle, CO
- Sun, Jun 17: Estes Park Marathon, Half Marathon, 10K & 5K in Estes Park, CO
July 2017
- Sat, Jul 1: Durango Half Marathon in Durango, CO
- Sat, Jul 1: Mountain Madness Half Marathon & 10K in Steamboat Springs, CO
- Tue, Jul 4: Longmont Half Marathon & 5K in Longmont, CO
- Sat, Jul 8: Sand Creek Half Marathon, 5K & 10K in Denver, CO
- Sat, Jul 15: Aspen Valley Marathon, Half Marathon & 5K in Aspen, CO
- Sat, Jul 22: All-Out Dog Days Half Marathon, 10K, 5K & 1-Mile in Westminster, CO
- Sat, Jul 22: La Sportiva Half Marathon, 5K & 10K in Red Cliff, CO
- Sat, Jul 22: Prairie Dog Half & 10K in Castle Rock, CO
- Sun, Jul 23: Longmont Trail Half Marathon, 10K & 5K in Longmont, CO
- Sat, Jul 29: Black Hawk Trail Half Marathon & 10K in Golden, CO
- Sat, Jul 29: Fort Collins Human Race Half Marathon, 10K & 5K in Fort Collins, CO
- Sat, Jul 29: Living Journeys Half Marathon in Mt. Crested Butte, CO
August 2017
- Sat, Aug 5: Winter Park Half Marathon & 5K in Winter Park, CO
- Sat, Aug 12: Aspen Backcountry Marathon & Half Marathon in Aspen, CO
- Sat, Aug 12: Georgetown to Idaho Springs Half Marathon in Georgetown, CO
- Sat, Aug 12: Mount Sneffels Marathon & Half Marathon in Ouray, CO
- Sat, Aug 12: Rocky Mountain Half Marathon in Estes Park, CO
- Sat, Aug 12: Run the Rockies Trail 10K & Half Marathon in Frisco, CO
- Sun, Aug 13: Beaver Creek Trail Half Marathon, 10K & 5K in Beaver Creek, CO
- Sun, Aug 13: Steamboat Stinger Marathon & Half Marathon in Steamboat Springs, CO
- Sat, Aug 19: Basalt Half Marathon in Basalt, CO
- Sat, Aug 19: Pikes Peak Ascent Half Marathon in Manitou Springs, CO
- Sun, Aug 20: Palmer Lake Half Marathon in Palmer Lake, CO
- Sat, Aug 26: All-Out Runapalooza Half Marathon, 10K, 5K & 1-Mile in Arvada, CO
- Sat, Aug 26: Bergen Peak Half Marathon in Evergreen, CO
- Sat, Aug 26: Thirsty 13 Half Marathon in Durango, CO
- Sun, Aug 27: Erie Half Marathon & 5K in Erie, CO
September 2017
- Sun, Sep 3: Breck Crest Mountain Marathon, Half Marathon & 10K in Breckenridge, CO
- Mon, Sep 4: American Discovery Trail Marathon, Half Marathon & 10K in Colorado Springs, CO
- Mon, Sep 4: Highlands Ranch Half Marathon & 5K in Highlands Ranch, CO
- Mon, Sep 4: Labor Day Mini Marathon, 10K & 5K in Parker, CO
- Mon, Sep 4: Walsh Pikermi Half Marathon in Walsh, CO
- Sat, Sep 9: American Heroes Run Marathon, Half Marathon, Ultra & 5K in Longmont, CO
- Sat, Sep 9: Arvada Harvest Half Marathon, 10K, 5K & 10-Mile in Arvada, CO
- Sat, Sep 9: Black Squirrel Half Marathon in Fort Collins, CO
- Sat, Sep 9: Ned*Ned Race Half Marathon, 10K & 5K in Nederland, CO
- Sat, Sep 9: Under Armour Mountain Running Series Marathon, Half Marathon, 10K, 5K & 1K in Copper Mountain, CO
- Sun, Sep 10: Dam U Half Marathon & 5K in Aurora, CO
- Sat, Sep 16: Autumn Color Run Half Marathon, 10K, 5K & Fun Run in Buena Vista, CO
- Sat, Sep 16: Breckenridge Road Marathon, Half Marathon & 10K in Breckenridge, CO
- Sat, Sep 16: Center of the Nation Series Marathon, Half Marathon, 10K & 5K in Sterling, CO
- Sat, Sep 16: Denver Trail Half Marathon & 10K in Greenwood Village, CO
- Sat, Sep 16: Prairie Dog Half Marathon & 5K in Westminster, CO
- Sun, Sep 17: Equinox Half Marathon & 5-Mile in Fort Collins, CO
- Sun, Sep 17: Hermit Pass Marathon, Half Marathon & 13K in Westcliffe, CO
- Sat, Sep 23: All-Out Fallfest Marathon, Half Marathon, 10K, 5K & 1-Mile in Westminster, CO
- Sat, Sep 23: Camp 4 Coffee Cart to Cart Trail Run in Crested Butte, CO
- Sat, Sep 23: Golden Leaf Half Marathon in Aspen, CO
- Sat, Sep 23: Hoof It 4 Harlie Half Marathon, 10K & 5K in Colorado City, CO
- Sat, Sep 23: Mountain Rats Half Marathon in Eagle, CO
- Sat, Sep 23: Snow Mountain Ranch Half Marathon, 10K & 5K in Granby, CO
- Sat, Sep 30: Colorado Springs Marathon, Half Marathon & 5K in Colorado Springs, CO
- Sat, Sep 30: Mountain Chile Cha Cha in Pagosa Springs, CO
October 2017
- Sun, Oct 1: The Bear Chase Trail Half Marathon & 10K in Lakewood, CO
- Sun, Oct 1: Boulder Backroads Marathon, Half Marathon & 10K in Boulder, CO
- Sat, Oct 7: Beulah Challenge Half Marathon, 10K & 5K in Beulah, CO
- Sat, Oct 7: Castle Rock Trail Festival Marathon, Half Marathon, 10K, 5K & 50K in Castle Rock, CO
- Sat, Oct 7: Durango Double Trail Run Half Marathon & 5K in Durango, CO
- Sat, Oct 7: Glenwood Canyon Shuffle Half Marathon in Glenwood Springs, CO
- Sat, Oct 7: Moonlight Miles 10K & Half Marathon in Clifton, CO
- Sun, Oct 8: Boulder Rez Marathon, 3/4 Marathon, Half Marathon & 10K in Boulder, CO
- Sun, Oct 8: Louisville Trail Half Marathon, 10K & 5K in Louisville, CO
- Sun, Oct 8: Xterra Marathon of Trail Races in Colorado Springs, CO
- Sun, Oct 15: Rock ‘n’ Roll Denver Half Marathon, 10K & 5K in Denver, CO
- Sun, Oct 22: Nun Run Half Marathon & 5K in Centennial, CO
- Sun, Oct 29: All-Out Kooky-Spooky Half Marathon, 10K & 5K in Golden, CO
- Sun, Oct 29: Westy Half & 5K in Westminter, CO
November 2017
- Thu, Nov 2: Sunset Marathon, Half Marathon & 5K – Denver in Denver, CO
- Sat, Nov 4: Backcountry Wilderness Half Marathon in Highlands Ranch, CO
- Sat, Nov 4: On the House Half Marathon in Englewood, CO
- Sat, Nov 4: Rim Rock Marathon & Half Marathon in Grand Junction, CO
- Mon, Nov 6: Southwest Series Marathon, Half Marathon, 10K & 5K – Day 2 in Durango, CO
December 2017
- Sat, Dec 9: All-Out Fa La La Half Marathon, 10K & 5K in Westminster, CO
