Race calendar · September 2026
137 Half Marathon races across the US in September 2026, sorted by date. Which weekends are busiest, what the fields actually run, entry fees, and where each one starts.
137 Half Marathon races in September 2026
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.
By the numbers
The September Half Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
It is a lean month for the Half Marathon. September carries 137, against 523 in October and 56 in August, the quietest. A September race is worth planning around rather than picking late, because the one that fits your training block may be the only one within reach.
The busiest weekend is September 26 and September 27, with 133 Half Marathon races on those two days, and the single busiest day is Saturday, September 26 with 105. Another 4 fall on a weekday, which is worth knowing if you are traveling for one.
As early as you can. 16 of these September Half Marathon races already have a price increase on the calendar, and 107 are open for entry right now. Another 29 have published an opening date and have not opened yet.
The typical entry is $30, with paid entries running from $10 up to $500, and 1 that are free to enter. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.
Across the 37 of these September Half Marathon races with published results from past editions, the median finisher ran 2:13:27, and the median winning time was 1:29:53. So anything under 2:13:27 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 44 runners, across the 37 of these September 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 3:27:15.
Texas has 16, Florida has 15, California has 11, Michigan has 10, New York has 9. If you are willing to travel, those are the states where a September weekend gives you the most to choose from.
Yes, 9 races around the United States get you off the pavement: 5 are trail races, and 4 mix road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.
August and October sit either side of September, which is where most people look next when a date does not fit.
