Which Colorado cities have the most Half Marathon races?
Centennial (29), Westminster (7), Colorado Springs (6), Fort Collins (5) lead the state for Half Marathon races. Those give you the most dates to choose from if your schedule is tight.
Colorado · Half Marathon
Half Marathon Races in Colorado
Every upcoming Half Marathon in Colorado, all 77 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
77 upcoming Half Marathon races · 36 with finish-time stats
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.
Half Marathon Races by City
Soonest Half Marathon Races in Colorado
77 total Sat, Aug 1, 2026Popsicle 5K/10K/Half - Colorado Springs Colorado Springs, COFrom $38Details Sun, Aug 2, 2026Bound for Boston Marathon & Half Marathon - Denver Denver, COFrom $65Details Fri, Aug 7, 2026Choice City Running Festival Fort Collins, COFrom $33Details Sat, Aug 8, 2026All-Out Runapalooza Arvada, COFrom $55Details Sat, Aug 15, 2026Run for PB& J 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register Sat, Aug 15, 2026Bagel Run 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register Sun, Aug 16, 2026Erie Half & 5k Erie, COFrom $45Details Sat, Aug 22, 2026Byers Peak Stampede Half Marathon & 5K Run Fraser, COFrom $65Details Sat, Aug 22, 2026Staunton Rocks! Marathon and Half Marathon Pine, COFrom $110Details Sun, Aug 23, 2026Pioneer Prairie Dog Half, 10k & 5k Westminster, COFrom $45Details Sat, Aug 29, 2026TBK Bank Thirsty 13 Half Marathon Durango, COFrom $105Details Sat, Aug 29, 2026Sloth Run 5K/10K/13.1 DENVER/AURORA Centennial, COFrom $30Register
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 Running a Half Marathon in Colorado
When are most Half Marathon races held in Colorado?
August is the busiest month for Half Marathon races in Colorado, with 13 of the 77, followed by September with 13. If you are flexible on the date, that is the quickest way to narrow things down.
How much do Colorado Half Marathon races cost?
Entry fees for Half Marathon races here run from $20 to about $500, depending on the event and how early you register.
How early should I register for a Half Marathon in Colorado?
32 of the 77 Half Marathon races in Colorado already have a price increase scheduled, so entry gets more expensive the longer you leave it. Race pricing almost always steps up as the date approaches, and signing up early is usually the cheapest option.
Are Colorado Half Marathon races beginner-friendly?
Yes, for the most part. Across the 34 Half Marathon races in Colorado with published results, the typical median finish is around 2:10:45, 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, 13 races around Colorado get you off the pavement: 7 are trail races, and 6 mix road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.