Race calendar · March 2027
334 half marathons across the US in March 2027, sorted by date. Which weekends are busiest, what the fields actually run, entry fees, and where each one starts.
March is the month where winter training meets its first real test. Conditions shift fast: the Gulf Coast and Southeast can serve up genuine warmth and humidity by mid-month, while the Northeast and Upper Midwest may still offer cold mornings, gusty winds, and unpredictable footing. Neither extreme is wrong for a 13.1, but you need a plan for both.
For most runners, a March half marathon lands near the end of a winter build or partway through a spring training block. That makes it useful as either a goal race or a hard effort you learn from. The calendar is spread across all four weekends, so there is genuine flexibility in when you race within the month.
First-timers will find March approachable in cooler regions, where the distance rewards steady pacing over raw heat tolerance. Experienced runners chasing a personal best should weigh course elevation and the regional forecast carefully: a warm, humid morning in the South can turn a target time into a damage-control effort.
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 March
Half marathons are not spread evenly across March. 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 March half marathons that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
It is one of the busier months. March carries 334 Half Marathon races, against 376 in April, which is the fullest month of the year. There is a real choice of dates here, with less competition for entries than the peak of the season.
Layering is the honest answer. Start-line temperatures in the North can demand gloves and a throwaway top; finishers may be warm before mile eight. In the South, assume it will feel warmer than expected and dress for that. Light, moisture-wicking fabric and nothing new on race day are the constants regardless of region.
Cooler Northern and Western regions in March suit first-timers well, since manageable temperatures reward the steady, conservative pacing that new runners need most. Southern races carry more weather risk by mid-month. Picking a course with reliable crowd support and clear cutoff times matters more at this distance than any particular weekend.
A standard half marathon build runs roughly ten to fourteen weeks from consistent base mileage. Starting in December gives you a full winter block before March. If your base is thin coming out of the holidays, prioritize building easy mileage in January before adding intensity, rather than compressing a full plan into eight weeks.
In fall, temperatures typically drop through the race. In March they often rise, especially in the South and on exposed courses. Starting conservatively matters more when warmth is building. If your race is in a region still dealing with cold, wind can slow you on exposed sections even when your legs feel ready. Check the course map for shelter.
The busiest weekend is March 20 and March 21, with 107 of them, 90 of those on Saturday, March 20. Another 3 fall on a weekday, which is worth knowing if you are traveling for one.
Across the 165 of these March half marathons with published results from past editions, the median finisher ran 2:12:30, and the median winning time was 1:26:41. So anything under 2:12:30 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 73 runners, across the 165 of these March 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 3:25:47.
Florida has 38, Texas has 36, California has 34, Georgia has 21, North Carolina has 20. If you are willing to travel, those are the states where a March weekend gives you the most to choose from.
Yes, 8 races around the United States get you off the pavement: 5 are trail races, and 3 mix road and trail.
