When in July are most half marathons held?
The busiest weekend in Colorado is July 17 and July 18, with 3 of them, 2 of those on Saturday, July 17. Every one of them is on a Saturday or a Sunday.
Race calendar · July 2027 · Colorado
Half Marathons in Colorado in July 2027
Every Half Marathon in Colorado in July 2027, all 5 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
What the field actually runs
July Half Marathons, By the Numbers
2:10:50Median finish time
1:17:41Median winning time
83Median field size
5July half marathons with published results
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 Nov 12, 2026.
When in July
The July Race Weekends
Half marathons are not spread evenly across July. Here is how the calendar actually falls, weekend by weekend, which is the part worth knowing before you book a trip or plan a taper around one.
By the numbers
The Biggest Field
The largest field of any July Half Marathon in Colorado, from the most recent published results.
Colorado Half Marathons by City in July
All Half Marathons in Colorado in July
5 total Sat, Jul 10, 2027All-Out Dog Days Westminster, COFrom $65Details Sat, Jul 17, 2027Summer Splash Prairie Dog Half, 10k, & 5k Castle Rock, COFrom $74Details Sat, Jul 17, 2027Heatwave Half Marathon/5K/10K - Denver Denver, COFrom $52Details Sun, Jul 18, 2027Heatwave Half Marathon/5K/10K - Colorado Springs Colorado Springs, COFrom $42Details Sat, Jul 31, 2027Popsicle 5K/10K/Half - Colorado Springs Colorado Springs, CORegistration opens Feb 24, 2027From $30Details
Common Questions About Running a July Half Marathon in Colorado
What is a good Half Marathon time?
Across the 5 of these July half marathons with published results from past editions, the median finisher ran 2:10:50, and the median winning time was 1:17:41. So anything under 2:10:50 puts you in the faster half of a typical field. That is the middle of these RunSignup fields, walkers and charity entrants included, not a national average.
How big is a typical July Half Marathon field?
The median one finished 83 runners, across the 5 of these July half marathons with published results from past editions. Most are far smaller than the big-city events people picture, which means less crowding at the start and a friendlier field, with a last recorded finisher at 3:33:40.