Race calendar · August 2027
102 half marathons across the US in August 2027, sorted by date. Which weekends are busiest, what the fields actually run, entry fees, and where each one starts.
August is the hardest month to race 13.1 miles in the United States. Heat and humidity have had all summer to build, and in the South and much of the interior, they peak right now. Early start times are the norm, shade becomes a course feature worth researching, and hydration planning matters more than your pace chart.
The calendar is selective, and that selectivity is itself useful information. Races that do schedule in August tend to lean on elevation, northern latitude, or coastal air to make the distance manageable. Colorado leads the state count, and mountain towns, lake settings, and northern Midwest venues show up consistently. If you are willing to travel toward cooler ground, August opens up.
For runners on a fall marathon build, an August half fits neatly as a hard long effort with a bib attached, not a peak race. Go in expecting a slower clock than you would post in October, run the effort rather than the pace, and you will come out of it fitter. Runners chasing a time PR should wait for cooler air unless the course and elevation genuinely favor it.
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 Nov 12, 2026.
When in August
Half marathons are not spread evenly across August. 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 largest field of any August Half Marathon, from the most recent published results.
It is one of the thinnest months of the year for the Half Marathon. August carries 102, against 376 in April. Expect to book earlier and travel further, and start from the states below rather than from a date.
For most runners, yes, racing at full effort in the Deep South or Texas heat in August is a real risk. The humidity compounds the heat, and the 13.1-mile distance leaves little margin for error. If you are set on an August race in those regions, treat it as a training effort, dial back your pace target, and prioritize hydration from the first mile.
Lightweight, moisture-wicking fabric and as little of it as race rules allow. Light colors reflect more sun. A hat or visor with a brim is worth adding to your kit. Skip the arm sleeves and compression tights unless the race is at high elevation where morning temperatures can drop sharply before the sun climbs.
Often yes, precisely because geography does so much work this month. Races at elevation or in northern states can offer genuinely comfortable morning conditions that flat, low-elevation alternatives in warm regions cannot match. If your home region is hot and humid in August, traveling toward cooler ground is one of the most effective moves you can make.
Count back roughly three to four months and you land in April or May, which means training through the warmest part of the spring buildup. That heat exposure is actually useful preparation. Your long runs will feel harder than the equivalent effort in cooler weather, but arriving at the start line heat-adapted is a genuine advantage over runners who have trained indoors.
The busiest weekend is August 7 and August 8, with 27 of them, 24 of those on Saturday, August 7. Every one of them is on a Saturday or a Sunday.
Across the 65 of these August half marathons with published results from past editions, the median finisher ran 2:12:32, and the median winning time was 1:30:34. So anything under 2:12:32 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 65 runners, across the 65 of these August 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 3:25:10.
Florida has 13, North Carolina has 9, California has 7, Wisconsin has 7, Colorado has 6. If you are willing to travel, those are the states where an August weekend gives you the most to choose from.
Yes, 7 races around the United States get you off the pavement: 4 are trail races, and 3 mix road and trail.
