The 10 th 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
5K: T-Shirt
1K: T-Shirt
| Distance | Price | Opens | Closes |
|---|---|---|---|
| 5K | $25.00 | Mar 3 | May 30 |
| $30.00 | May 31 | Jun 19 | |
| $35.00 | Jun 20 | Jun 20 | |
| 1K | $0.00 | Jan 15 | Jun 20 |
| Year | Finishers | Median Time | Fastest Time |
|---|---|---|---|
| 2025 | 269 | 40:26 | 21:29 |
| 2024 | 265 | 31:41 | 16:06 |
| 2023 | 186 | 31:30 | 17:52 |
| 2022 | 188 | 32:50 | 17:56 |
| 2021 | 168 | 32:18 | 17:05 |
Interested in this race?