Colorado · Half Marathon

2026-2027 Half Marathons in Colorado

Every upcoming Half Marathon in Colorado, all 87 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.

87 upcoming half marathons · 48 with finish-time stats

5K Races 18710K Races 91Marathons 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 field1,908 finishersHorsetooth Half Marathonin the Half MarathonLongest-running22nd year22nd Annual Run Through Time Trail Marathon and Half Marathonannual tradition

Colorado Half Marathons by City

Centennial 29Colorado Springs 14Arvada 7Denver 7Westminster 6Golden 2Littleton 2Fort Collins 2Aurora 1Pueblo 1Salida 1Severance 1Wellington 1Englewood 1Estes Park 1Longmont 1Louisville 1Steamboat Springs 1Windsor 1Georgetown 1Castle Rock 1Erie 1Fraser 1Durango 1

Half Marathons in Colorado by Month

November 2026 10December 2026 6January 2027 6February 2027 8March 2027 10April 2027 13May 2027 6June 2027 6July 2027 5August 2027 6September 2027 5

The Next Half Marathons in Colorado

87 total
Sat, Oct 31, 2026Spooky Sprint - Colorado Springs Colorado Springs, CO5K10KHalf MarathonPricing TBADetails Sat, Oct 31, 2026PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA Centennial, CO5K10KHalf Marathon1 MileRegistration closedFrom $65View race Sat, Oct 31, 2026Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA Centennial, CO5K10KHalf Marathon1 MileRegistration closedFrom $65View race Sun, Nov 1, 2026All-Out Kooky-Spooky Golden, COHalf Marathon10K5KFrom $85Details Sat, Nov 7, 2026Turkey Trails- Denver Littleton, CO50m1 Mile5K10KFrom $79Details Sun, Nov 8, 2026Turkey Trails - Colorado Springs Colorado Springs, CO50m1 Mile5K10KFrom $66Details Sat, Nov 14, 2026Run for Mental Health 5K/10K/13.1 DENVER/AURORA Centennial, CO5K10KHalf Marathon1 MileFrom $50Register Sat, Nov 14, 2026Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA Centennial, CO5K10KHalf Marathon1 MileFrom $50Register Sat, Nov 14, 2026Salute to Veterans 5K/10K/Half Marathon - Denver Aurora, CO5K10KHalf MarathonFrom $15Details Sun, Nov 15, 2026Salute to Veterans 5K/10K/Half Marathon Colorado Springs, CO5K10KHalf MarathonFrom $15Details Sat, Nov 21, 2026TURKEY TREK (13.1, 10k, 5k & 2k) Arvada, COHalf Marathon10K5K2KFrom $74Details Sat, Nov 28, 2026Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA Centennial, CO5K10KHalf Marathon1 MileFrom $50Register

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 Half Marathon in Colorado

Which Colorado cities have the most half marathons?

Centennial (29), Colorado Springs (14), Arvada (7), Denver (7) lead the state for Half Marathon races. Those give you the most dates to choose from if your schedule is tight.

When are most half marathons held in Colorado?

April is the busiest month for Half Marathon races in Colorado, with 13 of the 87, followed by November with 10. If you are flexible on the date, that is the quickest way to narrow things down.

Are Colorado Half Marathon races beginner-friendly?

Yes, for the most part. Across the 45 Half Marathon races in Colorado with published results, the typical median finish is around 2:11:42, 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 Half Marathon races in Colorado?

Yes, 8 races around Colorado get you off the pavement: 5 are trail races, and 3 mix road and trail.