Race calendar · October 2026
523 Half Marathon races across the US in October 2026, sorted by date. Which weekends are busiest, what the fields actually run, entry fees, and where each one starts.
523 Half Marathon races in October 2026
October is the busiest month on the US half marathon calendar, and the density of options is both the appeal and the complication. Races cluster across all five weekends, so you can almost always find something within driving distance, but choosing well means thinking harder about region and conditions than you would in spring.
Weather is the defining variable. In the Northeast and Midwest, mid-October often brings the crisp, cool mornings that runners train all summer to reach. The South, Southwest, and coastal regions can still carry real heat and humidity well into the month, meaning the same date on the calendar can feel like two completely different races depending on where you line up.
For most runners, an October 13.1 is either a goal race at the end of a summer build or a tune-up before a late-fall marathon. Either way, the race calendar cooperates: options span small local events, large multi-distance weekends, themed runs tied to Halloween and harvest season, and destination courses worth building a trip around. Start planning earlier than feels necessary.
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 October
Half Marathon races do not spread evenly across October. The busiest weekend is October 10 and October 11, with 133 of them. Another 14 fall on a weekday.
By the numbers
The October Half Marathon races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
It is the fullest month of the year for the Half Marathon. October carries 523 of them, more than any other month, so you get the widest choice of dates, locations and course types without having to travel far for one.
It depends almost entirely on where you are racing. Northern and mountain courses can open cold enough to need gloves and a throwaway layer at the start, with temperatures dropping further if rain or wind arrives. Southern and coastal courses may still call for heat-management gear and sun protection. Check the forecast for that specific city the week before, not just the month.
A standard half marathon training block runs roughly twelve to fourteen weeks, which means a late-June start puts you in solid shape for early October. If you are using the race as a goal event after a summer of base building, you may already be further along than you think. If you are starting from a low base, give yourself the full build rather than compressing it.
October is one of the strongest months for destination racing because fall foliage, harvest festivals, and Halloween themes give events a sense of occasion that goes beyond the finish line. Flights and hotels fill early when a race anchors a weekend, and popular events in scenic regions tend to sell out well ahead of spring races. Book travel as soon as your registration is confirmed.
Early October still carries summer's edge in much of the South and parts of the West, while late October brings a sharper risk of cold snaps and rain across northern states. The last weekend of October also collides with Halloween, which fills many races with costumes and adds a festive atmosphere that can slow aid stations and make course photography unavoidable. Pick accordingly.
Confirm registration is still open, verify the course is certified if a personal record attempt matters to you, and read the cancellation and deferral policy before paying. Check whether a price increase is already scheduled, since a significant share of October races have one. Also confirm the course cutoff time aligns with your expected pace, especially for larger events with road closures.
The busiest weekend is October 10 and October 11, with 133 Half Marathon races on those two days, and the single busiest day is Saturday, October 10 with 107. Another 14 fall on a weekday, which is worth knowing if you are traveling for one.
As early as you can. 124 of these October Half Marathon races already have a price increase on the calendar, and 504 are open for entry right now. Another 14 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 2 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 233 of these October Half Marathon races with published results from past editions, the median finisher ran 2:13:00, and the median winning time was 1:26:58. So anything under 2:13:00 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 70 runners, across the 233 of these October 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 3:28:59.
Texas has 58, Florida has 46, California has 41, Washington has 24, North Carolina has 22. If you are willing to travel, those are the states where an October weekend gives you the most to choose from.
Yes, 54 races around the United States get you off the pavement: 34 are trail races, and 20 mix road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.
September and November sit either side of October, which is where most people look next when a date does not fit.
