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 Oct 25, 2026.
When in May
The May Race Weekends
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.
May 1 - May 22
May 8 - May 91
May 22 - May 231
May 29 - May 301
By the numbers
The Biggest Field
The largest field of any May Marathon in California, from the most recent published results.
Common Questions About Running a May Marathon in California
What is a good Marathon time?
Across the 3 of these May marathons with published results from past editions, the median finisher ran 6:33:55, and the median winning time was 4:19:48. So anything under 6:33:55 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 Marathon field?
The median one finished 21 runners, across the 3 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 8:12:25.
Are there trail marathons in California in May?
Yes, one race around California gets you off the pavement: 1 is a trail race.