Colorado · Race calendar

Running Races in Colorado

Every upcoming running race in Colorado, all 284 of them. 5Ks, 10Ks, half marathons and marathons with dates, pricing, finish-time stats from past results, and start-line maps.

284 upcoming races · 140 with finish-time stats

5K 21410K 87Half Marathon 77Marathon 11Ultra 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 field3,409 finishersYMCA Turkey Trot 5Kin the 5KLongest-running20th year20th Annual Golden Gallopannual tradition

Races by City in Colorado

Arvada 11Aurora 6Boulder 4Buena Vista 3Centennial 32Colorado Springs 20Denver 36Durango 3Fort Collins 12Golden 3Grand Junction 6Greeley 4Highlands Ranch 3Littleton 14Louisville 3Loveland 8Manitou Springs 3Palmer Lake 3Parker 4Pueblo 7Steamboat Springs 3Thornton 9Westminster 12Windsor 4

Soonest Races in Colorado

284 total
Sat, Jul 18, 2026Denver, CO Galloway Training Program Denver, COFrom $91Details Sat, Aug 1, 2026Kennebec Mountain Run Hesperus, CO15 MilesFrom $90Details Sat, Aug 1, 202612th Annual Run for the Ring Aurora, CO5KFrom $43Details Sat, Aug 1, 2026Nielson Challenge Colorado Springs, CO2 MilesFreeDetails Sat, Aug 1, 2026Sheep Mountain Trail Runs Fairplay, CO14.2 Miles33 Miles53.1 MilesFrom $100Details Sat, Aug 1, 2026Unicorn 5k (South) Highlands Ranch, CO5KFrom $20Details Sat, Aug 1, 2026Flying Colors 5K Fun Run/Walk Craig, CO5KFrom $30Details Sat, Aug 1, 2026STEPS TO EMPOWER Colorado Springs, CO1 Mile5KFrom $25Details Sat, Aug 1, 2026RunAbilities FUN Walk/Run/Roll Parker, CO2 MilesFrom $25Details Sat, Aug 1, 2026Popsicle 5K/10K/Half - Colorado Springs Colorado Springs, CO5K10KHalf MarathonFrom $38Details Sat, Aug 1, 2026Move with MADD Denver 5K Denver, CO5KFrom $15Register Sun, Aug 2, 2026Bound for Boston Marathon & Half Marathon - Denver Denver, COMarathonHalf MarathonFrom $65Details

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 Jul 27, 2026.

Common Questions About Racing in Colorado

Which Colorado cities have the most races?

Denver (36), Centennial (32), Colorado Springs (20), Littleton (14) have the most upcoming races in Colorado. If you are willing to travel an hour or two, those give you the widest choice of dates and distances.

What race distances can I run in Colorado?

Colorado has 5K (214), 10K (87), Half Marathon (77), Marathon (11), Ultra (5). Pick a distance to narrow the list to races you would actually enter.

When is race season in Colorado?

September is the busiest month for races in Colorado, with 71 of the 284, followed by August with 64. If you are flexible on the date, that is the quickest way to narrow things down.

Are Colorado races beginner-friendly?

Yes, for the most part. Across the 140 races in Colorado with published results, the typical median finish is around 37:55, 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 races in Colorado?

Yes, 52 races around Colorado get you off the pavement: 39 are trail races, and 13 mix road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.