Colorado · Half Marathon
Half Marathons in Colorado
Colorado currently has 55 upcoming half marathons with a confirmed date listed in RaceRove. Centennial, Colorado Springs, Littleton and Denver have the largest concentration of events.
August (8), October (8) and February (6) are the busiest months on the calendar right now. Another 27 annual half marathons are waiting for next year's date to be announced.
- Upcoming, date confirmed
- 55
- Active listings
- 82
- Cities with races
- 40
More ways to browse Colorado
Upcoming half marathons in Colorado
All 55 with a confirmed date, soonest first.
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Run Through Time Trail Marathon and Half MarathonSalida, COMarathonHalf Marathon10K5K +1 more ~3,133 runners
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Lucky Brew Race 5K, 10K, 15k & Half MarathonSeverance, COHalf Marathon5K10K9.3 Miles +1 more ~2,200 runners
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Bound for Boston Marathon & Half Marathon - DenverDenver, COMarathonHalf Marathon10K5K ~150 runners
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Golden Harvest Half Marathon & 5k/10k - DenverWestminster, COHalf Marathon50m1 Mile5K +1 more ~10 runners
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Golden Harvest Half Marathon & 5k/10k - Colorado SpringsColorado Springs, COHalf Marathon50m1 Mile5K +1 more
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Colorado Springs Marathon, Half, 5K, and Kids KColorado Springs, COMarathonHalf Marathon10K5K +1 more ~2,500 runners
Dates come from each race's own listing. Always confirm on the organiser's site before you book travel.
Largest half marathon events in Colorado
By estimated field size across all distances at the event.
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Run Through Time Trail Marathon and Half MarathonSalida, COMarathonHalf Marathon10K5K +1 more ~3,133 runners
When half marathons happen in Colorado
- January
- 3 upcoming races
- February
- 6 upcoming races
- March
- 2 upcoming races
- April
- 4 upcoming races
- May
- 4 upcoming races
- June
- 4 upcoming races
- July
- 2 upcoming races
- August
- 8 upcoming races
- September
- 5 upcoming races
- October
- 8 upcoming races
- November
- 6 upcoming races
- December
- 3 upcoming races
Colorado cities with the most half marathons
- Centennial
- 12 upcoming races
- Colorado Springs
- 8 upcoming races
- Littleton
- 4 upcoming races
- Denver
- 3 upcoming races
- Westminster
- 3 upcoming races
- Fort Collins
- 2 upcoming races
- Boulder
- 2 upcoming races
- Estes Park
- 2 upcoming races
Running in Colorado cities
Annual events awaiting their next date
These half marathons are held every year, but the next date isn't in the listing yet. The month shown is when each is usually held.
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Blue Sky Trail Marathon & Half MarathonFort Collins, CO Usually held in October · next date not announcedMarathonHalf Marathon26.7 Miles13.4 Miles ~1,200 runners
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Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile RunWindsor, CO Usually held in October · next date not announcedMarathonHalf Marathon10K5K +1 more ~660 runners
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Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half MarathonCanon City, CO Usually held in October · next date not announcedHalf Marathon5K8 Miles ~400 runners
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Aspen BackcountryAspen, CO Usually held in August · next date not announced50 KilometerMarathonHeavy Half Marathon ~123 runners
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Staunton Rocks! Marathon and Half MarathonPine, CO Usually held in August · next date not announcedMarathonHalf Marathon10K5K ~112 runners
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The Bear ChaseLakewood, CO Usually held in October · next date not announced100K50 Mile50KHalf Marathon +2 more ~89 runners
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Mancos Cowboy Half Marathon, 5K, and Fun RunMancos, CO Usually held in October · next date not announcedHalf Marathon5K1 Mile ~74 runners
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Snow Mountain RanchGranby, CO Usually held in September · next date not announced50K33KHalf Marathon10K +1 more ~33 runners
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Bagel Run 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in October · next date not announcedHalf Marathon5K10K1 Mile
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Black Squirrel Half MarathonBellvue, CO Usually held in September · next date not announcedHalf Marathon5K
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Colorado Mountain Half+ SeriesLittleton, CO Usually held in September · next date not announcedHalf Marathon5-Event SeriesSeries 3 PackSeries 4 Pack
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Deep Creek Trail Half MarathonTelluride, CO Usually held in September · next date not announced1/2 Marathon
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Durango MarathonDurango, CO Usually held in October · next date not announcedMarathonHalf Marathon5K
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Mt. Sneffels Half Marathon-10K-Kids-Fun RunRidgway, CO Usually held in August · next date not announced10KHalf Marathon 13.1MKids Fun Run
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National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in September · next date not announcedHalf Marathon5K10K1 Mile
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NEDNED Trail FestNederland, CO Usually held in September · next date not announced10K5KHalf Marathon
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NUN RUNCentennial, CO Usually held in September · next date not announced1 Mile Family Fun Walk1 Mile Family Pack - 4 or More5K RunHalf Marathon +1 more
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Oktoberfest Run 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in September · next date not announcedHalf Marathon5K10K1 Mile
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Run for Breast Cancer 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in August · next date not announcedHalf Marathon5K10K1 Mile
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Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in July · next date not announcedHalf Marathon5K10K1 Mile
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Run for Donuts 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in September · next date not announcedHalf Marathon5K10K1 Mile
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Run for Mental Health 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in September · next date not announcedHalf Marathon5K10K1 Mile
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Run for PB& J 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in August · next date not announcedHalf Marathon5K10K1 Mile
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Sloth Run 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in August · next date not announcedHalf Marathon5K10K1 Mile
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Trail Sisters Women's Half Marathon & 10kBuena Vista, CO Usually held in September · next date not announcedHalf Marathon5K10K
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WILD Wahatoya RunsLa Veta, CO Usually held in September · next date not announced50K1/2 Marathon8 Miler
Half Marathons in nearby states
Guides from the RaceRove blog
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 4 min read Diplo's Run Club 2026-27: Every City, Date and Course Diplo's Run Club is a 5K with a post-race concert. Every US date for 2026-27 (San Francisco, New York, Los Angeles, San Diego and Phoenix), start times and courses.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Half Marathons in Colorado: common questions
- How many half marathons are there in Colorado?
- RaceRove currently lists 55 upcoming half marathons in Colorado with a confirmed date, plus 27 annual events whose next date hasn't been announced yet.
- How long is a half marathon?
- A half marathon is 13.1 miles (21.1 kilometres).
- Which Colorado cities have the most half marathons?
- By upcoming events listed in RaceRove: Centennial (12), Colorado Springs (8), Littleton (4), Denver (3) and Westminster (3).
- When is half marathon season in Colorado?
- Of the upcoming half marathons listed, the busiest months are August (8), October (8) and February (6).
- What is the biggest half marathon in Colorado?
- By estimated field size, the largest event with a half marathon listed in Colorado is the Denver Colfax Marathon, with about 25,000 runners across all of its distances.
Search every half marathon in Colorado
Filter by month, course profile and field size, save races to a shortlist and compare them side by side in the interactive search.