View some of the best Half Marathon races in Boulder, Colorado! RaceMob's race calendar allows you to find races that suits your needs. Use our advanced filters below or calendar on the right, and discover new races. We try to maintain up to date information, and rely heavily on our community of volunteers. If you find a race that we're missing, use the "Suggest Race" button on the right. Find RaceMob discounts that others have added or add deals that you've discovered.
From the heart of the West Metro area and the Stenger Soccer Complex, All-Out brings you our 10th annual Polar Prowl! Along with its Endless Series sidekick in June, Summer Breeze, these 5K, 10K and Half Marathon courses will follow Van Bibber Cre...
We would love to have you join us for this fun event that kicks off our Prairie Dog Race Series! Make it your annual Martin Luther King Jr. remembrance weekend event! Yes, we run in January and for many of the years, we've enjoyed WARM race morni...
Welcome to the 8th annual All-Out Mardi Crawl! From the award winning Apex Center, these 5K, 10K & Half Marathon courses will run west along the 2020 Best of the Best Ralston Creek Trail through Arvada's open spaces and stunning golf course co...
*Register by Sunday at midnight the weekend BEFORE the race to be guaranteed a shirt!Join us for the annual Time to Paddy 5k/10k and Lucky 13.1 Half Marathon! A St. Patrick-themed run that is perfect for the whole family. The fun includes great s...
From the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 12th annual Spring Fever from Jefferson County's NAAC Stadium… easily accessible from several nearby highways. Along with its Endless Series sid...
Welcome to Denver's Best Spring Half Marathon! Saturday April 7, 2024 at Cherry Creek State Park Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a half marathon course that is flat, fas...
One of Colorado's favorite trails meets one of its most glorious parks at our 12th annual Beat the Heat! As courses wind southwest along Big Dry Creek Trail, the remarkable sight of Standley Lake with the Flatirons on the horizon will come into vi...
Welcome to the 51st running of the Horsetooth Half Marathon. Your race will take you on a scenic point-to-point journey from the location of Hughes Stadium, the former home of the CSU Rams, to the finish line party at New Belgium Brewery. On the w...
Roads? ....where we're going we don't need roads!Celebrate kicking off the New Year right and come Time Travel through our events! You’ll be doing the hustle through the far-out miles of this tubular race man! With all the other cool groovy chicks...
Saturday, April 27, 2024Half Marathon, Marathon and 50K all Start at 7:00 a.m. If you want your name included on the finisher's medal ribbon, and to be guaranteed a finisher medal, you must register before March 22, 2024. If registration for a d...
Big News for 2024! We are excited to announce we are changing the format of Weld Your Mettle in 2024. We are challenging our community to run 3, 6, 9, 12, or 24 hours as an individual or a relay team. We will have a loop course of 2-4 miles and e...
From the heart of the West Metro area and the Stenger Soccer Complex, All-Out brings you our 12th annual Summer Breeze! Along with its Endless Series sidekick in January, Polar Prowl, these 5K, 10K and Half Marathon courses will follow Van Bibber ...
Celebrate Independence Day with us, and join the Half Marathon or 5k distance! Walkers and Runners of all abilities welcome!
Get ready for some fun in the sun and a great mid-season test of your training as we bring our 12th Annual Dog Days 5K, 10K & Half Marathon! Centrally located between Denver & Boulder along with its Endless Series sidekick in December Fa L...
Welcome to the Summer Splash Prairie Dog Half, 10k & 5k in Castle Rock, Colorado. Part of the Prairie Dog Half race series, join us in July as we race through Castle Rock along the East Plum Creek Trail. For all race info, click the "race in...
Join us for a weekend of running and scenic mountain views in historic Estes Park, Colorado just outside Rocky Mountain National Park. Race Dates:5K - August 2, 2024Half Marathon - August 3, 2024 Run one race or register for the Elk Double and ...
As those summer mornings are just beginning to cool, join us for a celebration to end the season and our 11th Annual Runapalooza! From the award winning Apex Center, these 5K, 10K & Half Marathon courses will run west along the 2020 Best of th...
Join us for the Erie Half and 5k! The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas. LOOK UP! At the Erie event, we often see the early morning skies with...
Celebrate the last blast of summer at the Labor Day Half Marathon. Sweat your socks off and let summer have its last hooray at Parker’s Salisbury Park, just a few miles southeast of Denver. There’s a distance to meet every taste with a half marath...
One of Colorado's favorite trails meets one of its most glorious parks at our 9th annual Fallfest! As courses wind southwest along Big Dry Creek Trail, the remarkable sight of Standley Lake with the Flatirons on the horizon will come into view. It...
The Autumn Run is held each year on the third weekend in September, in and around the historic, friendly, and picturesque town of Buena Vista, Colorado. Nestled in the upper Arkansas River Valley at the base of the Collegiate Peaks, the Autumn Run...
Welcome to the Pioneer Prairie Dog Half Marathon event; the one that started the series! With 10k and 5k events too! Everyone is back to school and slipping into a routine. Make this your mental health break as you break away from the chaos of ...
Welcome to the Windsor Marathon. This event starts and ends at The Island at Pelican Lakes in Water Valley, with a great after party including breakfast, drinks, music and a live band! Tour beautiful Windsor on a variety of terrain, through golf c...
Join us on a journey from Fort Collins to Loveland. The marathon begins at Edora Park in Fort Collins and ends at Fairgrounds Park in Loveland. The half marathon starts at Fossil Creek Park and also ends at Fairgrounds Park in Loveland. Along the ...
Join us for the Westy Half in October where finishers from every distance earn a MEDAL! In 2023 we will be moving back to the Westminster Promenade for the Westy Half and 5k! Join the Half Marathon or 5k distance! Walkers and Runners of all abi...
From the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 13th annual Kooky-Spooky from Jefferson County's NAAC Stadium… easily accessible from several nearby highways. Along with its Endless Series sid...
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