Race calendar · September 2026 · Massachusetts

September 2026 5K Races in Massachusetts

Every 5K in Massachusetts in September 2026, all 18 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.

18 5K races in September 2026

10K in SeptemberHalf Marathon in September

What the field actually runs

September 5K Races, By the Numbers

33:01Median finish time
17:54Median winning time
279Median field size
4September 5K 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.

By the numbers

The Biggest and Longest-Running

The September 5K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.

Largest field282 finishersColin's Joy Project 5Kin the 5KLongest-running9th year9th Annual Run for Recovery 5K in Tewksburyannual tradition

September 5K Races by City

Boston 3Barre 1Brookline 1Harvard 1Lincoln 1Lowell 1Medway 1Millis 1Newburyport 1Northborough 1Plainville 1Shirley 1Tewksbury 1West Harwich 1Williamstown 1Worcester 1
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Soonest 5K Races in September

18 total
Fri, Sep 25, 2026ATO X FIJI 5K for Hope Worcester, MA5KFreeDetails Sat, Sep 26, 20262026 AFCEA Run/Walk For STEM 5K Lincoln, MA5KFrom $25Details Sat, Sep 26, 2026Applefest 5k Road Race Northborough, MA5KFrom $35Details Sat, Sep 26, 20262026 Medway Police Chase 5K & Kids Fun Run Obstacle Course Medway, MA5K1 MileFrom $15Details Sat, Sep 26, 2026Colin's Joy Project 5K Boston, MA5K100m0.5 MilesFrom $30Details Sat, Sep 26, 2026St. Mary’s 5K Brookline, MA5KFrom $30Details Sat, Sep 26, 20265K For the Children West Harwich, MA5KFrom $40Details Sat, Sep 26, 2026Williamstown Community Chest Fun Run/Walk Williamstown, MA5K1 MileFrom $5Details Sat, Sep 26, 2026Trot The Track 5K Plainville, MA5KFrom $44Details Sat, Sep 26, 2026Muddy Paws 5k Lowell, MA5K1 MileFrom $45Details Sat, Sep 26, 2026Lace up for Dementia Awareness Barre, MA5KFrom $15Details Sun, Sep 27, 2026GNOCA 5K RUN/WALK IN HONOR OF JACKIE POOR AND PAULA HOLM Newburyport, MA5KFrom $35Details

Common Questions About Running a September 5K in Massachusetts

When in September are most 5K races held?

The busiest weekend in Massachusetts is September 26 and September 27, with 17 5K races on those two days, and the single busiest day is Saturday, September 26 with 10. Another 1 fall on a weekday, which is worth knowing if you are traveling for one.

When should I sign up for a September 5K?

As early as you can. 7 of these September 5K races already have a price increase on the calendar, and 16 are open for entry right now. Another 2 have published an opening date and have not opened yet.

How much does a September 5K cost to enter?

The typical entry is $30, with paid entries running from $5 up to $45, and 2 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 5K time?

Across the 4 of these September 5K races with published results from past editions, the median finisher ran 33:01, and the median winning time was 17:54. So anything under 33:01 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 September 5K field?

The median one finished 279 runners, across the 4 of these September 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 58:47.

5K Races in Other Months

August and October sit either side of September, which is where most people look next when a date does not fit.

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