Race calendar · August 2027 · Colorado
Every Half Marathon in Colorado in August 2027, all 6 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
6 Half Marathon races in August 2027
What the field actually runs
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 Sep 22, 2026.
When in August
Half Marathon races do not spread evenly across August. The busiest weekend is August 21 and August 22, with 2 of them.
By the numbers
The August Half Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
As early as you can. 6 of these August Half Marathon races already have a price increase on the calendar, and 4 are open for entry right now. Another 2 have published an opening date and have not opened yet.
The typical entry is $45, with paid entries running from $35 up to $89. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.
Across the 6 of these August Half Marathon races with published results from past editions, the median finisher ran 2:16:41, and the median winning time was 1:24:00. So anything under 2:16:41 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.
The median one finished 109 runners, across the 6 of these August Half Marathon races 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 3:51:17.
Yes, one race around Colorado gets you off the pavement: 1 is a trail race. Surfaces are not always published, so it is worth checking a specific race before you register.
July and September sit either side of August, which is where most people look next when a date does not fit.
