Is May a good month for an Ultra?
May sits in the middle of the year for the Ultra, carrying 17 against 45 in October and 4 in August. Enough to choose from, and easier to get into than the races at the peak of the season.
Race calendar · May 2027
May 2027 Ultra Races in the United States
17 Ultra races 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.
17 Ultra races in May 2027
What the field actually runs
May Ultra Races, By the Numbers
7:27:49Median finish time
4:38:29Median winning time
51Median field size
7May Ultra races with published results
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 May
The May Race Weekends
Ultra races do not spread evenly across May. The busiest weekend is May 1 and May 2, with 4 of them. Another 2 fall on a weekday.
By the numbers
The Biggest and Longest-Running
The May Ultra races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
May Ultra Races by State
May Ultra Races by City
Soonest Ultra Races in May
17 total Sat, May 1, 2027Greenland Trail Races Larkspur, COFrom $35Details Sat, May 1, 2027Sunshine Double Winter Park, FLFrom $30Details Sat, May 1, 2027UltraTrax Greek Peak Cortland, NYFrom $68Details Sun, May 2, 2027Cocodona Charity Bibs Black Canyon City, AZFreeDetails Fri, May 7, 2027Traverse City Trail Running Festival Traverse City, MIFrom $35Details Sat, May 8, 2027Dawn To Dusk To Dawn Track Ultras Sharon Hill, PAFrom $100Details Sat, May 8, 202716th Anniversary Rock N' Run Allentown, PARegistration opens Sep 30From $30Details Sat, May 8, 2027Grizzly Peak Trail Run Berkeley, CAFrom $60Details Sat, May 8, 2027Trail Mix Race Rockford, MNFrom $30Details Mon, May 10, 20273 Days at the Fair Augusta, NJRegistration opens Sep 30From $150Details Sat, May 15, 2027KEYS100 Ultramarathon Key West, FLFrom $240Details Sat, May 15, 2027Endure Trail Runs Divide, CORegistration opens Dec 1From $60Details
Common Questions About Running a May Ultra
When in May are most Ultra races held?
The busiest weekend is May 1 and May 2, with 4 Ultra races on those two days, and the single busiest day is Saturday, May 8 with 4. Another 2 fall on a weekday, which is worth knowing if you are traveling for one.
When should I sign up for a May Ultra?
As early as you can. 15 of these May Ultra races already have a price increase on the calendar, and 13 are open for entry right now. Another 4 have published an opening date and have not opened yet.
How much does a May Ultra cost to enter?
The typical entry is $60, with paid entries running from $30 up to $240, 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.
What is a good Ultra time?
Across the 7 of these May Ultra races with published results from past editions, the median finisher ran 7:27:49, and the median winning time was 4:38:29. So anything under 7:27:49 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.
How big is a typical May Ultra field?
The median one finished 51 runners, across the 7 of these May Ultra 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 9:41:38.
Which states have the most May Ultra races?
Florida has 3, California has 2, Colorado has 2, New York has 2, Pennsylvania has 2. If you are willing to travel, those are the states where a May weekend gives you the most to choose from.
Are there trail Ultra races in May?
Yes, 6 races around the United States get you off the pavement: 6 are trail races. Surfaces are not always published, so it is worth checking a specific race before you register.
Ultra Races in Other Months
April and June sit either side of May, which is where most people look next when a date does not fit.