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
The May Race Weekends
5K races 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 21
May 8 - May 92
May 22 - May 232
By the numbers
The Biggest Field
The largest field of any May 5K in Delaware, from the most recent published results.
Common Questions About Running a May 5K in Delaware
What is a good 5K time?
Across the 4 of these May 5K races with published results from past editions, the median finisher ran 41:29, and the median winning time was 19:24. So anything under 41:29 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 5K field?
The median one finished 150 runners, across the 4 of these May 5K 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 1:19:06.
Are there trail 5K races in Delaware in May?
Yes, one race around Delaware gets you off the pavement: 1 is a trail race.