Colorado · Marathon
Marathons in Colorado
Colorado currently has 10 upcoming marathons with a confirmed date listed in RaceRove. Fort Collins, Colorado Springs, Crawford and Durango have the largest concentration of events.
October (6), May (2) and March (1) are the busiest months on the calendar right now. Another 13 annual marathons are waiting for next year's date to be announced.
- Upcoming, date confirmed
- 10
- Active listings
- 23
- Cities with races
- 15
More ways to browse Colorado
Upcoming marathons in Colorado
All 10 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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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 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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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
When marathons happen in Colorado
- March
- 1 upcoming race
- May
- 2 upcoming races
- October
- 6 upcoming races
- November
- 1 upcoming race
Colorado cities with the most marathons
- Fort Collins
- 3 upcoming races
- Colorado Springs
- 2 upcoming races
- Crawford
- 1 upcoming race
- Durango
- 1 upcoming race
- Fruita
- 1 upcoming race
- Salida
- 1 upcoming race
- Windsor
- 1 upcoming race
Annual events awaiting their next date
These 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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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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Steamboat MarathonSteamboat Springs, CO Usually held in June · date not confirmedMarathonHalf ~2,000 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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Aspen BackcountryAspen, CO Usually held in August · next date not announced50 KilometerMarathonHeavy Half Marathon
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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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Staunton Rocks! Marathon and Half MarathonPine, CO Usually held in August · next date not announcedMarathonHalf Marathon10K5K
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.
- 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.
- 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.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Marathons in Colorado: common questions
- How many marathons are there in Colorado?
- RaceRove currently lists 10 upcoming marathons in Colorado with a confirmed date, plus 13 annual events whose next date hasn't been announced yet.
- How long is a marathon?
- A marathon is 26.2 miles (42.2 kilometres).
- Which Colorado cities have the most marathons?
- By upcoming events listed in RaceRove: Fort Collins (3), Colorado Springs (2), Crawford (1), Durango (1) and Fruita (1).
- When is marathon season in Colorado?
- Of the upcoming marathons listed, the busiest months are October (6), May (2) and March (1).
- What is the biggest marathon in Colorado?
- By estimated field size, the largest event with a marathon listed in Colorado is the Denver Colfax Marathon, with about 25,000 runners across all of its distances.
Search every 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.