Colorado · Marathon

2027 Marathons in Colorado

Every upcoming Marathon in Colorado, all 6 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.

6 upcoming marathons · 5 with finish-time stats

5K Races 18710K Races 91Half Marathons 87Ultramarathons 5
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By the numbers

The Biggest and Longest-Running

The Colorado races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.

Largest field1,322 finishersThe Colorado Marathonin the Half MarathonLongest-running22nd year22nd Annual Run Through Time Trail Marathon and Half Marathonannual tradition

Colorado Marathons by City

Salida 1Fort Collins 1Eaton 1Steamboat Springs 1Denver 1Colorado Springs 1

The Next Marathons in Colorado

6 total
Sat, Mar 13, 202722nd Annual Run Through Time Trail Marathon and Half Marathon Salida, COMarathonHalf Marathon2 MilesRegistration opens Nov 1From $83Details Sun, May 2, 2027The Colorado Marathon Fort Collins, COMarathonHalf Marathon10K5KFrom $160Details Sat, Jun 5, 2027Weld Your Mettle Running Festival Eaton, CO50 Miles100K4.3 Miles14 MilesFrom $80Details Sun, Jun 6, 2027The Steamboat Marathon Steamboat Springs, COMarathonHalf Marathon10K0.5 MilesFrom $130Details Sun, Aug 1, 2027Bound for Boston Marathon & Half Marathon - Denver Denver, COMarathonHalf MarathonRegistration opens Dec 1From $75Details Sat, Oct 2, 2027Colorado Springs Marathon, Half, 5K, and Kids K Colorado Springs, COMarathonHalf Marathon5K1KFrom $60Details

How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Oct 25, 2026.

Common Questions About Running a Marathon in Colorado

Which Colorado cities have the most marathons?

Salida (1), Fort Collins (1), Eaton (1), Steamboat Springs (1) lead the state for Marathon races. Those give you the most dates to choose from if your schedule is tight.

When are most marathons held in Colorado?

June is the busiest month for Marathon races in Colorado, with 2 of the 6. If you are flexible on the date, that is the quickest way to narrow things down.

Are Colorado Marathon races beginner-friendly?

Yes, for the most part. Across the 5 Marathon races in Colorado with published results, the typical median finish is around 4:34:39, which means half of every one of those fields came in slower than that. Recreational runners and walk-runners are the bulk of these fields, not the exception.

Are there trail Marathon races in Colorado?

Yes, one race around Colorado gets you off the pavement: 1 is a trail race.