West · CO
Running Races in Colorado
Colorado currently has 210 upcoming races with a confirmed date listed in RaceRove. Denver, Colorado Springs, Centennial and Littleton have the largest concentration of events.
By distance, that includes 143 5Ks, 63 10Ks, 38 half marathons and 10 marathons. Many events offer more than one distance, so a race can appear in more than one of those counts.
October (66), November (39) and September (33) are the busiest months on the calendar right now. Another 195 annual races are waiting for next year's date to be announced.
- Upcoming, date confirmed
- 210
- Active listings
- 405
- Cities with races
- 106
Browse Colorado races by distance
Upcoming races in Colorado
The next 60 of 210 with a confirmed date, soonest first.
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Healthy Kids Running Series Fall - La Junta, COLa Junta, CO
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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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Kids' Fall Series - Where Kids Run Free!Colorado Springs, CO
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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 races 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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Mile High United Way Turkey TrotDenver, CO Usually held in November · date not confirmed4 Mile ~11,600 runners
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Cherry Creek SneakDenver, CO Usually held in April · date not confirmed10 Mile5 Mile5K ~8,000 runners
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FORTitude 10KFort Collins, CO Usually held in September · date not confirmed10Kplus shorter community options ~7,000 runners
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Rock 'n' Roll Denver Marathon & Half MarathonDenver, CO Usually held in October · date not confirmedMarathonHalf10K5K ~7,000 runners
When races happen in Colorado
- January
- 7 upcoming races
- February
- 7 upcoming races
- March
- 5 upcoming races
- April
- 10 upcoming races
- May
- 12 upcoming races
- June
- 7 upcoming races
- July
- 4 upcoming races
- August
- 1 upcoming race
- September
- 33 upcoming races
- October
- 66 upcoming races
- November
- 39 upcoming races
- December
- 19 upcoming races
Colorado cities with the most races
- Denver
- 19 upcoming races
- Colorado Springs
- 19 upcoming races
- Centennial
- 17 upcoming races
- Littleton
- 12 upcoming races
- Fort Collins
- 8 upcoming races
- Westminster
- 8 upcoming races
- Arvada
- 8 upcoming races
- Estes Park
- 6 upcoming races
Annual events awaiting their next date
These races 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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Mile High United Way Turkey TrotDenver, CO Usually held in November · date not confirmed4 Mile ~11,600 runners
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Cherry Creek SneakDenver, CO Usually held in April · date not confirmed10 Mile5 Mile5K ~8,000 runners
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FORTitude 10KFort Collins, CO Usually held in September · date not confirmed10Kplus shorter community options ~7,000 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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Highlands Ranch Turkey Day 5KHighlands Ranch, CO Usually held in November · date not confirmed5K ~3,000 runners
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Pikes Peak Marathon & AscentManitou Springs, CO Usually held in September · next date not announcedMarathonAscent (13.3 mi) ~2,600 runners
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Colorado Springs MarathonColorado Springs, CO Usually held in October · date not confirmedMarathonHalf ~2,500 runners
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Leadville Trail MarathonLeadville, CO Usually held in June · date not confirmedTrail Marathon ~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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Garden of the Gods 10 MileColorado Springs, CO Usually held in June · date not confirmed10 Mile10KTrail RunYouth Classic ~1,800 runners
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Imogene Pass RunOuray, CO Usually held in September · next date not announced17.1 Mile ~1,550 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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Run the Rocks at Red RocksMorrison, CO Usually held in October · date not confirmed10K5K ~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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Leadville Trail 100 RunLeadville, CO Usually held in August · date not confirmed100 Miles ~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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Vail HillClimbVail, CO Usually held in July · date not confirmed7.6 Mile uphill trail run ~500 runners
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10k at 10,000 FeetSteamboat Springs, CO Usually held in September · next date not announced8 Miles4 Miles
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9/11 Heroes Run - Denver, ColoradoDenver, CO Usually held in September · next date not announced5K1 Miles
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American Heroes RunLongmont, CO Usually held in September · next date not announced100 Miler24 hrs6 hour open startVirtual - Any Distance
Races in nearby states
Guides from the RaceRove blog
- 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.
- 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.
- 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.
Running Races in Colorado: common questions
- How many races are there in Colorado?
- RaceRove currently lists 210 upcoming races in Colorado with a confirmed date, plus 195 annual events whose next date hasn't been announced yet.
- Which Colorado cities have the most races?
- By upcoming events listed in RaceRove: Denver (19), Colorado Springs (19), Centennial (17), Littleton (12) and Fort Collins (8).
- When is race season in Colorado?
- Of the upcoming races listed, the busiest months are October (66), November (39) and September (33).
- What is the biggest race in Colorado?
- By estimated field size, the largest race listed in Colorado is the BolderBOULDER 10K, with about 50,000 runners across all of its distances.
Search every race 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.