Colorado · Race calendar

2026-2027 Running Races in Colorado

Every upcoming running race in Colorado, all 258 of them. 5Ks, 10Ks, half marathons and marathons with dates, pricing, finish-time stats from past results, and start-line maps.

258 upcoming races · 136 with finish-time stats

5K Races 19910K Races 93Half Marathons 90Marathons 6Ultramarathons 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-running22nd year22nd Annual Run Through Time Trail Marathon and Half Marathonannual tradition

Races by City in Colorado

Alamosa 3Arvada 14Boulder 5Buena Vista 3Centennial 30Colorado Springs 31Denver 40Estes Park 4Fort Collins 12Golden 4Grand Junction 6Littleton 5Longmont 4Louisville 4Loveland 6Palmer Lake 3Pueblo 8Salida 3Steamboat Springs 3Thornton 3Westminster 11Windsor 3

Holiday Races in Colorado

Halloween 5Ks and Races in Colorado 2026 15Turkey Trots in Colorado 2026 33Christmas 5Ks and Races in Colorado 2026 14New Year's 5Ks and Races in Colorado 2027 5

Colorado Races by Month

October 2026

November 2026

December 2026

January 2027

February 2027

March 2027

April 2027

May 2027

June 2027

July 2027

August 2027

September 2027

Soonest Races in Colorado

258 total
Sat, Jul 18, 2026Denver, CO Galloway Training Program Denver, COFrom $91Details Sun, Sep 27, 2026Grand Valley Brew Runs Grand Junction, CO5KFrom $35Details Thu, Oct 1, 2026Segment Traildown Fort Collins, COFreeDetails Sat, Oct 3, 2026Colorado Springs Marathon, Half, 5K, and Kids K Colorado Springs, COMarathonHalf Marathon5K1KFrom $20Details Sun, Oct 4, 2026Kids' Fall Series - Where Kids Run Free! Colorado Springs, CORegistration closedFreeDetails Sun, Oct 4, 2026Fall Series - Get Dirty! Get Muddy! Colorado Springs, CO3.8 Miles4 Miles5.4 Miles7.3 MilesFrom $39Details Thu, Oct 15, 2026DPS League Meet Denver, CO5KRegistration closedPricing TBADetails Thu, Oct 15, 2026Denver Public Schools League Meet Denver, CO5KRegistration closedPricing TBAView race Sat, Oct 17, 2026The Great Trailhead Foot Race 5 & 10 Miler Lakewood, CO5 Miles10 MilesFrom $75Details Sat, Oct 17, 2026Beti Bike Bash Elbert, CO4.5 MilesRegistration closedFrom $40Details Sat, Oct 17, 2026Living Water 5K and Family Fun Walk/Jog Denver, CO5K1 MileFrom $25Details Sat, Oct 17, 2026The Great Pumpkin Haul Fruita, CO2 MilesFrom $40Register

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 15, 2026.

Common Questions About Racing in Colorado

Which Colorado cities have the most races?

Denver (40), Colorado Springs (31), Centennial (30), Arvada (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 (199), 10K (93), Half Marathon (90), Marathon (6), Ultra (5). Pick a distance to narrow the list to races you would actually enter.

When is race season in Colorado?

November is the busiest month for races in Colorado, with 62 of the 258, followed by October with 47. 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 136 races in Colorado with published results, the typical median finish is around 37:35, 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, 24 races around Colorado get you off the pavement: 17 are trail races, and 7 mix road and trail.