RaceMob

Upcoming Boulder, Co Half Marathon Races

View some of the best Half Marathon races in Boulder, Co! 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.

    • 1/2M

    Golden, CO

    14.03 miles away

    I'm Attending

    All-Out Kooky-Spooky

    From the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 14th annual Kooky-Spooky from Jefferson County's NAAC Stadium… easily accessible from several nearby highways. Along with its Endless Series sid...

    • 1/2M

    Fort Collins, CO

    39.75 miles away

    I'm Attending

    The Long View Marathon

    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 ...

    • 1/2M

    Westminster, CO

    13.85 miles away

    I'm Attending

    Pioneer Prairie Dog Half, 10k & 5k

    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 ...

    • 1/2M

    Denver, CO

    24.77 miles away

    I'm Attending

    Spooky Sprint - Denver

    / 2 RaceMobbers Scheduled

    Join us for the annual Spooky Sprint 5k/10k & Half Marathon!  A fun, Halloween-themed event that is perfect for the whole family. The fun includes - Great Swag - designer shirt & custom medal Chip-timing with live results and awards...

    • 1/2M

    Westminster, CO

    13.92 miles away

    I'm Attending

    All-Out Fall Fest

    / 4 RaceMobbers Scheduled

    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...

    • 1/2M

    Parker, CO

    44.26 miles away

    I'm Attending

    Labor Day Half Marathon

    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...

    • 1/2M

    Pine, CO

    36.28 miles away

    I'm Attending

    Staunton Rocks! Marathon and Half Marathon

    Welcome to the Staunton Rocks! Marathon & Half, an event put on by trail runners for trail runners. Touring the renowned singletrack of Staunton State Park in Colorado’s Front Range Mountains southwest of Denver, the race will take you back in...

    • 1/2M

    Denver, CO

    25.5 miles away

    I'm Attending

    Bound for Boston Marathon & Half Marathon - Denver

    Have you been dreaming of running Boston?  Need to shave a few minutes off your time to qualify?  Looking for the perfect course to set a PR?  Regardless, if you want to run Boston or not, THIS is the event for you!     We...

    • 1/2M

    Arvada, CO

    14.65 miles away

    I'm Attending

    All-Out Runapalooza

    / 2 RaceMobbers Scheduled

    As those summer mornings are just beginning to cool, join us for a celebration to end the season and our 12th Annual Runapalooza! From the award winning Apex Center, these 5K, 10K & Half Marathon courses will run west along the 2020 Best of th...

    • 1/2M

    Estes Park, CO

    27.49 miles away

    I'm Attending

    Rocky Mountain Half Marathon & 5K

    Join us for a weekend of running and scenic mountain views in historic Estes Park, Colorado just outside Rocky Mountain National Park.  Run one race or register for the Elk Double and run both to earn the Double medal and extra race swag!

    • 1/2M

    Westminster, CO

    13.92 miles away

    I'm Attending

    All-Out Dog Days

    Get ready for a sun-soaked adventure and a fantastic mid-season challenge with our 13th Annual Dog Days 5K, 10K & Half Marathon, benefiting Do Over Dogs! Held in a central location between Denver and Boulder, our courses wind northeast along t...

    • 1/2M

    Denver, CO

    24.77 miles away

    I'm Attending

    Hometown Half Marathon & 5k/10k - Denver

    Join us for the annual Hometown Half Marathon & 5k/10k! A run local-themed event that is perfect for the whole family.The fun includes - Great Swag - designer shirt & custom medal Chip-timing with live results and awards Pacers for the ...

    • 1/2M

    Arvada, CO

    14.65 miles away

    I'm Attending

    All-Out Summer Breeze

    / 2 RaceMobbers Scheduled

    Join us for our 13th annual Summer Breeze, at the Stenger Soccer Complex in the heart of the West Metro area! This event features the scenic Van Bibber Creek Trail winding west through Arvada's expansive open spaces, offering breathtaking views of...

    • 1/2M

    Eaton, CO

    47.63 miles away

    I'm Attending

    Weld Your Mettle Running Festival

    Join us for four days of running excitement! Whether you're tackling the timed events individually or teaming up for relays: 3, 6, 9, 12, or 24-hour formats, or taking on a 7K Run or Ruck, there's an event for everyone. Experience the thrill of fr...

    • 1/2M

    Denver, CO

    24.77 miles away

    I'm Attending

    DoNot Stop Half Marathon (5k/10k) - Denver

    Question:  Is it supposed to be DO NOT STOP, or DONUT STOP?  Answer:  YES! Like Running or Walking?  Love Donuts?  This race is for you! Join us for the annual DoNot Stop Half Marathon, 5k/10k! A donut-themed event th...

    • 1/2M

    Longmont, CO

    15.93 miles away

    I'm Attending

    Longmont Half & 5k (LM Half)

    Longmont's only Half Marathon - now offered in the cooler month of MAY!  Join the Half Marathon or 5k distance!  Walkers and Runners of all abilities welcome!

    • 1/2M

    Brighton, CO

    21.77 miles away

    I'm Attending

    Runs With Scissors Races

    Saturday, April 26, 2025Half 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 21, 2024. If registration for a dis...

    • 1/2M

    Estes Park, CO

    28.32 miles away

    I'm Attending

    Bigfoot Half Marathon

    A road half marathon & 5k in beautiful Estes Park, finishing downtown amidst the infamous Bigfoot Days Festival.Finish in Bond Park surrounded by live music, Bigfoot celebrities, and a FREE festival featuring 50+ vendors and booths.​Once you'r...

    • 1/2M

    Westminster, CO

    13.92 miles away

    I'm Attending

    All-Out Beat the Heat

    Join us for the 13th annual Beat the Heat event, where one of Colorado's favorite trails meets one of its most glorious parks, all in support of Adaptive Adventures! Follow the winding courses southwest along Big Dry Creek Trail, and enjoy the bre...

    • 1/2M

    Severance, CO

    40.72 miles away

    I'm Attending

    Great Western Trail Race

    Run or walk as we celebrate Northern Colorado's newest trail, connecting Windsor, Severance and Eaton! Choose a 5k, 10k or half marathon - with a Great Western Trail Race finisher shirt, music and custom locally made prizes for top finishers. 

    • 1/2M

    Fort Collins, CO

    40.6 miles away

    I'm Attending

    Horsetooth Half Marathon

    Welcome to the 52nd 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...

    • 1/2M

    Englewood, CO

    33.82 miles away

    I'm Attending

    Three Creeks Half Marathon

    Welcome to Denver's Best Spring Half Marathon! Sunday April 13, 2025 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, fast a...

    • 1/2M

    Golden, CO

    14.03 miles away

    I'm Attending

    All-Out Spring Fever

    From the base of Table Mountain and Colorado's spectacular foothills, All-Out Multicourse presents our 13th annual Spring Fever from Jefferson County's NAAC Stadium… easily accessible from several nearby highways. Along with its Endless Series sid...

    • 1/2M

    Wellington, CO

    49.55 miles away

    I'm Attending

    Spring Equinox

    Celebrate Spring with an early season race on scenic country roads.

    • 1/2M

    Denver, CO

    24.77 miles away

    I'm Attending

    Time to Paddy 5k/10k & Lucky 13.1 - Denver

    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 swag (designer shirt, custom medal), chip-timing, live results and awards, free photos,...

    • 1/2M

    Arvada, CO

    14.65 miles away

    I'm Attending

    All-Out Mardi Crawl

    Welcome to the 8th annual All-Out Mardi Crawl, a Mardi Gras run in the Denver area! 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 op...

    • 1/2M

    Louisville, CO

    7.38 miles away

    I'm Attending

    Arctic Prairie Dog Half, 10k & 5k

    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 ...

    • 1/2M

    Louisville, CO

    7.77 miles away

    I'm Attending

    Prairie Dog Run Series

    Join Peedy the Prairie Dog in Colorado every season for the Prairie Dog Race Series! Sign up for the distance of your choice - 5k, 10k or Half Marathon. Sign up for the season of your choice - Winter, Spring, Summer or Fall. Sign up for the city o...

    • 1/2M

    Arvada, CO

    16.66 miles away

    I'm Attending

    All-Out Polar Prowl

    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...

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