Race calendar · December 2026 · Massachusetts
Every 5K in Massachusetts in December 2026, all 14 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
14 5K races in December 2026
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 Sep 22, 2026.
When in December
5K races do not spread evenly across December. The busiest weekend is December 5 and December 6, with 7 of them. Another 2 fall on a weekday.
By the numbers
The December 5K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
The busiest weekend in Massachusetts is December 5 and December 6, with 7 5K races on those two days, and the single busiest day is Sunday, December 6 with 5. Another 2 fall on a weekday, which is worth knowing if you are traveling for one.
As early as you can. 9 of these December 5K races already have a price increase on the calendar, and 13 are open for entry right now. Another 1 have published an opening date and have not opened yet.
The typical entry is $39, with paid entries running from $10 up to $49, 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.
Across the 7 of these December 5K races with published results from past editions, the median finisher ran 32:22, and the median winning time was 17:31. So anything under 32:22 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 308 runners, across the 7 of these December 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 58:55.
November and January sit either side of December, which is where most people look next when a date does not fit.
