Race calendar · October 2027
115 half marathons across the US in October 2027, sorted by date. Which weekends are busiest, what the fields actually run, entry fees, and where each one starts.
The Northeast and upper Midwest can offer the crisp, reliable conditions runners train all summer to find. The South, Gulf Coast, and parts of the Southwest can still carry real heat and humidity at the start line, especially early in the month. A race in one region can feel like a completely different season from a race hundreds of miles away.
For most runners targeting a fall goal race, October lands at the end of a full summer training block, which means fitness is typically as high as it gets all year. That makes it a natural choice for a personal best attempt, but also for a tune-up before a late-fall marathon, or simply for a community event with a costume and a party at the finish.
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 October
Half marathons are not spread evenly across October. 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 October Half Marathon, from the most recent published results.
It is one of the thinnest months of the year for the Half Marathon. October carries 115, against 376 in April. Expect to book earlier and travel further, and start from the states below rather than from a date.
It depends entirely on where you are racing. In the northern states and higher elevations, mornings can be cold enough for gloves and a light layer at the start, which you may want to shed by mile three. In Texas, Florida, or along the Gulf Coast, a singlet and shorts may still be the right call. Check the local forecast within a week of race day rather than assuming fall means cool.
A standard half marathon build runs roughly ten to fourteen weeks, which puts a mid-October start date back to a late June or early July base. If you are coming off a summer of easy mileage, you are in a good position. If you are starting from scratch, the summer heat means your early training weeks will feel harder than the race eventually will, which is useful preparation for any lingering warmth on race day.
Many October events pair the half marathon with a full marathon, a 10K, or a 5K on the same weekend, which makes the calendar useful for groups where not everyone is running 13.1 miles. It also gives you flexibility if you arrive undertrained or overtrained: some events allow distance changes up to a point before race day, so reading the specific event's transfer policy when you register is a practical step.
The busiest weekend is October 9 and October 10, with 28 of them, 19 of those on Saturday, October 9. One more falls on a weekday, which is worth knowing if you are traveling for it.
Across the 83 of these October half marathons with published results from past editions, the median finisher ran 2:15:05, and the median winning time was 1:23:52. So anything under 2:15:05 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 82 runners, across the 83 of these October 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 3:32:07.
Texas has 19, Missouri has 7, Colorado has 6, Michigan has 6, New York has 6. If you are willing to travel, those are the states where an October weekend gives you the most to choose from.
Yes, 11 races around the United States get you off the pavement: 7 are trail races, and 4 mix road and trail.
