Jamaco River Run
- Date
- June 20, 2026
- Location
- Waterhouse Field, Merrimac, MA
- Distance
- ~5K (3.2 miles) Run/Walk · Kids 1K Fun Run (7 and Under)
From the Organizer
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
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
78°
Typical Low
56°
Chance of Rain
36%
Based on US Climate Normals data from Haverhill, 6 mi from the venue.
Host City
About Merrimac, MA
Elevation
89 ft
Nearest Airport
PSM
Portsmouth International Airport at Pease · 19 mi
Major Hub
BOS
Boston Logan International Airport · 33 mi
Time Zone
Eastern Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Jamaco River Run, put it on the calendar, and turn “someday” into a start date.
Coming Up
More Running races near Merrimac, MA
Amesbury Days 5K & 1 Mile
5K
4 miles away
Town and Country Half Marathon & 5K
Half Marathon · 5K
6 miles away
Cider Hill Farm 5K Summer Run
5K
4 miles away
Newburyport High Street Mile - Winners Circle Running Club
6 miles away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Jamaco River Run?
- Jamaco River Run is a running race held in Merrimac, Massachusetts on June 20, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Jamaco River Run?
- Saturday, June 20, 2026 in Merrimac, Massachusetts at Waterhouse Field, Merrimac, MA. Check the event page for exact start times and wave schedules.
- How do I register for the Jamaco River Run?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Jamaco River Run
Jun 20, 2026