Jamaco River Run
About this race
The 10th annual Jamaco River Run and Post-Race celebration will be held on Saturday, June 20, 2026. This is a fun, family-friendly day complete with a Kid's Fun Run, a USATF certified & sanctioned 5K road race, and a post-race event with music, a craft beer tent, burgers and dogs, activities for the kids, award ceremony and an amazing prize raffle. Registration & Bib Pickup will begin at 8am at Waterhouse Field (74 E. Main St, Merrimac, MA). Free parking is available on site. The Kids Fun Run kicks off at 9am followed by the 5K walk/run at 10am. The first 200 registrants receive a custom commemorative t-shirt, and a free beer (21+).
We are excited for 2026 to be our biggest turnout yet, and we once again look forward to giving back to our local community! Thank you for your support!
~ the Jamaco River Run Board of Directors
Pick your distance
Running
~5K (3.2 miles) Run/Walk
USATF Certified & Sanctioned
Kids 1K Fun Run (7 and Under)
Typical race-day weather
Based on 6 years of historical conditions on this event's race dates in Merrimac.
Course
Route map and elevation profile
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Other races near Merrimac
Different organizers, within 40 miles, in the next three months
Apple Harvest Run 2026
Cider Hill Farm 5K Fall Run
Will Run for Pie - Turkey Trot 5K Run/Walk
Cycle for Shelter - Emmaus, Inc.
🏃 Plan Your Next Race in Merrimac
Find upcoming events by distance:
- Merrimac Running Calendar 2026 2 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 2 Merrimac events
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