West · CO
Running Races in Colorado
Colorado currently has 190 upcoming races with a confirmed date listed in RaceRove. Denver, Colorado Springs, Centennial and Westminster have the largest concentration of events.
By distance, that includes 128 5Ks, 74 10Ks, 55 half marathons and 15 marathons. Many events offer more than one distance, so a race can appear in more than one of those counts.
November (42), August (23) and October (20) are the busiest months on the calendar right now. Another 215 annual races are waiting for next year's date to be announced.
- Upcoming, date confirmed
- 190
- Active listings
- 405
- Cities with races
- 106
Browse Colorado races by distance
Upcoming races in Colorado
The next 60 of 190 with a confirmed date, soonest first.
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City Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)Denver, CO5K10K ~2,743 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.
When races happen in Colorado
- January
- 9 upcoming races
- February
- 10 upcoming races
- March
- 5 upcoming races
- April
- 12 upcoming races
- May
- 14 upcoming races
- June
- 12 upcoming races
- July
- 8 upcoming races
- August
- 23 upcoming races
- September
- 15 upcoming races
- October
- 20 upcoming races
- November
- 42 upcoming races
- December
- 20 upcoming races
Colorado cities with the most races
- Denver
- 23 upcoming races
- Colorado Springs
- 22 upcoming races
- Centennial
- 14 upcoming races
- Westminster
- 9 upcoming races
- Littleton
- 7 upcoming races
- Arvada
- 7 upcoming races
- Fort Collins
- 6 upcoming races
- Loveland
- 5 upcoming races
Running in Colorado cities
Browse Colorado races by month
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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The Long View MarathonFort Collins, CO Usually held in October · next date not announcedMarathon10K5K ~6,084 runners
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Denver 5K On The RunwayDenver, CO Usually held in September · next date not announced5K Registration with Carpool Parking Pass5K Registration with Individual Parking PassYouth 5K Registration ~2,500 runners
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Parker Parks and Recreation So Long to Summer 5K/10KParker, CO Usually held in September · next date not announced5K10K ~2,500 runners
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West Line WinderBuena Vista, CO Usually held in September · next date not announced50K ~2,450 runners
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Emerald Mountain Trail RunSteamboat Springs, CO Usually held in October · next date not announced12K4 Miles ~2,250 runners
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Apex Foundation Trick or Trot 5K & Halloween HuntArvada, CO Usually held in October · next date not announced5K1 Mile ~2,100 runners
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Mountain Marmot Trail RunDurango, CO Usually held in September · next date not announced12 Miles ~1,911 runners
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BRR All-Comers Summer Track & Field Series #4Boulder, CO Usually held in July · next date not announced100m200m400m800m +1 more ~1,537 runners
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Big Waves Family 5K run/walkWestminster, CO Usually held in October · next date not announced5K ~1,514 runners
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Run the Rocks at Red RocksMorrison, CO Usually held in October · next date not announced10K5K ~1,500 runners
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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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Runway 5K - Run for the AngelsBroomfield, CO Usually held in September · next date not announced5K ~1,000 runners
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Suffer Better 10th Annual Fall Trail RunsPine, CO Usually held in October · next date not announced50K25K5K ~924 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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Cirque Series - Arapahoe Basin, COKeystone, CO Usually held in September · next date not announced9.4 Miles ~600 runners
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Mesa County Search & Rescue 5KFruita, CO Usually held in September · next date not announced5K ~550 runners
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Red Feather Trail JamboreeRed Feather Lakes, CO Usually held in September · next date not announced50 Miler50K5K94 Miles ~500 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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Your Story Isn't Over 5k/10k/Kids 1-MileLittleton, CO Usually held in October · next date not announced1 Mile10K5K ~300 runners
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Rubey Rescue RunAspen, CO Usually held in October · next date not announced3.5 Miles1 Mile ~270 runners
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Run Rabbit RunSteamboat Springs, CO Usually held in September · next date not announced100 Mile Hares100 Mile Tortoises ~264 runners
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Greenland Open Space Pack Burro RaceLarkspur, CO Usually held in September · next date not announced8 Miles3 Miles ~255 runners
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Rocky's Backyard UltraEstes Park, CO Usually held in October · next date not announcedBackyard Ultra ~250 runners
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Sage Burner Trail RaceGunnison, CO Usually held in October · next date not announced50K28K15K ~250 runners
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Aspen Valley MarathonAspen, CO Usually held in July · next date not announcedMarathon10K5K ~222 runners
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Fall Series - Get Dirty! Get Muddy!Colorado Springs, CO Usually held in October · next date not announced3.8 Miles4 Miles5.4 Miles7.3 Miles ~215 runners
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Above the Clouds UltraWoodland Park, CO Usually held in October · next date not announced50K10K ~200 runners
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Outlast DenverLittleton, CO Usually held in October · next date not announced18 Miles ~200 runners
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Grand Valley Brew RunsGrand Junction, CO Usually held in September · next date not announced5K ~175 runners
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Devil on the DivideEmpire, CO Usually held in September · next date not announced50K22K ~157 runners
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Outlast Colorado SpringsColorado Springs, CO Usually held in September · next date not announced18 Miles ~150 runners
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Pikes Peak UltraColorado Springs, CO Usually held in July · next date not announced50 Miler50K30K20K ~146 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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Kids' Fall Series - Where Kids Run Free!Colorado Springs, CO Usually held in October · next date not announcedKids Run ~120 runners
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Bridge Burner UltraCanon City, CO Usually held in October · next date not announced35 Miler50K35K10K ~119 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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Into the Hills Eltuck 10kBellvue, CO Usually held in August · next date not announced10K ~100 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
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.
- 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.
- 8 min read How to Choose Your First Marathon A practical checklist for choosing a first marathon based on course, weather, cutoff, travel, field size and support.
- 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 190 upcoming races in Colorado with a confirmed date, plus 215 annual events whose next date hasn't been announced yet.
- Which Colorado cities have the most races?
- By upcoming events listed in RaceRove: Denver (23), Colorado Springs (22), Centennial (14), Westminster (9) and Littleton (7).
- When is race season in Colorado?
- Of the upcoming races listed, the busiest months are November (42), August (23) and October (20).
- 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.