Race calendar · May 2027
46 marathons across the US in May 2027, sorted by date. Which weekends are busiest, what the fields actually run, entry fees, and where each one starts.
May marathons play out across genuinely different weather realities depending on where you are. The Pacific Northwest and the Mountain West can still feel like prime spring racing, while the South and the lower Midwest are warming fast, and humidity is already a factor in some coastal cities. Pick your venue with the forecast in mind, not just the date.
The 26.2 in May tends to attract runners who built through winter and want a spring payoff before summer heat shuts the door on goal-pace efforts. Early starts are common for a reason, and if your target race is in a warmer region, pacing conservatively in the first half is often the move that saves the back half.
Many May marathons share weekends with companion distances, so a travel weekend can serve more than one runner in a group. The holiday weekend late in the month draws its own crowd, which means lodging and logistics deserve early attention even when registration itself still has room.
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 May
Marathons are not spread evenly across May. 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 May Marathon, from the most recent published results.
It is one of the busier months. May carries 46 Marathon races, against 71 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.
In the South, along the Gulf Coast, and at lower elevations in general, early morning gun times are standard and worth confirming before race day. Northern and mountain venues have more flexibility, but even there, temperatures can climb faster than expected once the sun is up. Check the start time when you register, not the week before.
Layering at the start is sensible almost everywhere, because mornings can be cool enough for a throwaway layer even when the afternoon forecast looks warm. Lightweight, moisture-wicking kit is the baseline. In the Pacific Northwest or higher elevations, a light wind layer earns its place. In the South or Florida, sun protection and light colors matter more than warmth.
It can be, but the calendar is uneven. The opening weekend of the month carries far more races than any other, so if your travel window is flexible, that first weekend opens the widest set of options. The Memorial Day weekend draws runners and tourists alike, so hotels near popular race cities fill quickly and prices reflect the demand.
A full marathon build typically runs sixteen to twenty weeks, which puts a May start line at a training launch sometime in January. That means building a base through November and December before the formal plan begins. Runners who want a spring goal race and are not already running consistently should start their base work in the fall.
The busiest weekend is May 1 and May 2, with 15 of them, 9 of those on Saturday, May 1. One more falls on a weekday, which is worth knowing if you are traveling for it.
Across the 23 of these May marathons with published results from past editions, the median finisher ran 4:22:50, and the median winning time was 2:35:20. So anything under 4:22:50 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 235 runners, across the 23 of these May 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 6:57:35.
California has 5, Texas has 4, Washington has 4, Idaho has 3, Illinois has 3. If you are willing to travel, those are the states where a May weekend gives you the most to choose from.
Yes, 4 races around the United States get you off the pavement: 3 are trail races, and 1 mixes road and trail.
