Colorado · Half Marathon
Half Marathons in Colorado
Colorado currently has 38 upcoming half marathons with a confirmed date listed in RaceRove. Centennial, Colorado Springs, Fort Collins and Louisville have the largest concentration of events.
October (10), November (6) and September (4) are the busiest months on the calendar right now. Another 42 annual half marathons are waiting for next year's date to be announced.
- Upcoming, date confirmed
- 38
- Active listings
- 80
- Cities with races
- 39
More ways to browse Colorado
Upcoming half marathons in Colorado
All 38 with a confirmed date, soonest first.
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Colorado Springs Marathon, Half, 5K, and Kids KColorado Springs, COMarathonHalf Marathon10K5K +1 more
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Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half MarathonCanon City, COHalf Marathon5K8 Miles ~400 runners
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Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile RunWindsor, COMarathonHalf Marathon10K5K +1 more ~660 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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Denver Colfax MarathonDenver, CO Usually held in May · date not confirmedMarathonHalfUrban 10 MilerMarathon Relay +1 more ~25,000 runners
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Boulder MarathonBoulder, CO Usually held in September · date not confirmedMarathonHalf ~15,000 runners
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BoulderthonBoulder, CO Usually held in September · date not confirmedMarathonHalf Marathon10K5K +1 more ~15,000 runners
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Rock 'n' Roll Denver Marathon & Half MarathonDenver, CO Usually held in October · date not confirmedMarathonHalf10K5K ~7,000 runners
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Colorado Springs MarathonColorado Springs, CO Usually held in October · date not confirmedMarathonHalf ~2,500 runners
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Horsetooth Half MarathonFort Collins, CO Usually held in April · date not confirmedHalf ~2,000 runners
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HRCA Backcountry Wilderness Half MarathonHighlands Ranch, CO Usually held in November · date not confirmedHalf10K5K ~2,000 runners
When half marathons happen in Colorado
- January
- 2 upcoming races
- February
- 3 upcoming races
- March
- 2 upcoming races
- April
- 3 upcoming races
- May
- 3 upcoming races
- June
- 1 upcoming race
- July
- 1 upcoming race
- September
- 4 upcoming races
- October
- 10 upcoming races
- November
- 6 upcoming races
- December
- 3 upcoming races
Colorado cities with the most half marathons
- Centennial
- 15 upcoming races
- Colorado Springs
- 4 upcoming races
- Fort Collins
- 2 upcoming races
- Louisville
- 2 upcoming races
- Littleton
- 1 upcoming race
- Westminster
- 1 upcoming race
- Durango
- 1 upcoming race
- Estes Park
- 1 upcoming race
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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Denver Colfax MarathonDenver, CO Usually held in May · date not confirmedMarathonHalfUrban 10 MilerMarathon Relay +1 more ~25,000 runners
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Boulder MarathonBoulder, CO Usually held in September · date not confirmedMarathonHalf ~15,000 runners
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BoulderthonBoulder, CO Usually held in September · date not confirmedMarathonHalf Marathon10K5K +1 more ~15,000 runners
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Rock 'n' Roll Denver Marathon & Half MarathonDenver, CO Usually held in October · date not confirmedMarathonHalf10K5K ~7,000 runners
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Colorado Springs MarathonColorado Springs, CO Usually held in October · date not confirmedMarathonHalf ~2,500 runners
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Horsetooth Half MarathonFort Collins, CO Usually held in April · date not confirmedHalf ~2,000 runners
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HRCA Backcountry Wilderness Half MarathonHighlands Ranch, CO Usually held in November · date not confirmedHalf10K5K ~2,000 runners
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Steamboat MarathonSteamboat Springs, CO Usually held in June · date not confirmedMarathonHalf ~2,000 runners
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Frosty's Frozen 5K, 10K & Half MarathonLittleton, CO Usually held in January · date not confirmedHalf Marathon10K5K ~1,500 runners
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Super Half Marathon & Game Day 5KColorado Springs, CO Usually held in February · date not confirmedHalf Marathon5K ~1,500 runners
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Thirsty 13 Half MarathonDurango, CO Usually held in August · next date not announcedHalf Marathon ~1,500 runners
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Estes Park MarathonEstes Park, CO Usually held in June · date not confirmedMarathonHalf Marathon5 Mile ~1,000 runners
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Old Man Winter Rally RunLyons, CO Usually held in February · date not confirmed5K10KHalf Marathon ~1,000 runners
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Snowman StampedeLittleton, CO Usually held in February · date not confirmedHalf Marathon10K5K ~1,000 runners
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Georgetown to Idaho Springs Half MarathonIdaho Springs, CO Usually held in August · date not confirmedHalf ~800 runners
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Slacker Half MarathonGeorgetown, CO Usually held in June · date not confirmedHalf4 MileRelay ~800 runners
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Run the Rockies Trail Half MarathonFrisco, CO Usually held in August · date not confirmed5K10KHalf Marathon ~600 runners
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Mt. Sneffels Half Marathon & 10KOuray, CO Usually held in August · date not confirmedHalf Marathon10K ~500 runners
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Aspen BackcountryAspen, CO Usually held in August · next date not announced50 KilometerMarathonHeavy Half Marathon
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Black Squirrel Half MarathonBellvue, CO Usually held in September · next date not announcedHalf Marathon5K
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Bound for Boston Marathon & Half Marathon - DenverDenver, CO Usually held in August · next date not announcedMarathonHalf Marathon10K5K
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Byers Peak Stampede Half Marathon & 5K RunFraser, CO Usually held in August · next date not announcedHalf Marathon5K3 Miles
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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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Golden Harvest Half Marathon & 5k/10k - Colorado SpringsColorado Springs, CO Usually held in September · next date not announcedHalf Marathon50m1 Miles5K +1 more
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Golden Harvest Half Marathon & 5k/10k - DenverWestminster, CO Usually held in September · next date not announcedHalf Marathon50m1 Miles5K +1 more
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Labor Day Half MarathonParker, CO Usually held in September · next date not announcedHalf Marathon5K10K
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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 Miles
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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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Pioneer Prairie Dog Half, 10k & 5kWestminster, CO Usually held in August · next date not announcedHalf Marathon5K10K
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Popsicle 5K/10K/Half - Colorado SpringsColorado Springs, CO Usually held in August · next date not announcedHalf Marathon5K10K
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Run for Breast Cancer 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in August · next date not announcedHalf Marathon5K10K1 Miles
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Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in July · next date not announcedHalf Marathon5K10K1 Miles
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Run for Mental Health 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in September · next date not announcedHalf Marathon5K10K1 Miles
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Run for PB& J 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in August · next date not announcedHalf Marathon5K10K1 Miles
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Sloth Run 5K/10K/13.1 DENVER/AURORACentennial, CO Usually held in August · next date not announcedHalf Marathon5K10K1 Miles
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Snow Mountain RanchGranby, CO Usually held in September · next date not announced50K33KHalf Marathon10K +1 more
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Staunton Rocks! Marathon and Half MarathonPine, CO Usually held in August · next date not announcedMarathonHalf Marathon10K5K
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.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- 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 38 upcoming half marathons in Colorado with a confirmed date, plus 42 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 (15), Colorado Springs (4), Fort Collins (2), Louisville (2) and Littleton (1).
- When is half marathon season in Colorado?
- Of the upcoming half marathons listed, the busiest months are October (10), November (6) and September (4).
- 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.