Lace up for an inspiring journey at the Mystic River Herring Run 5K, set for Sunday, May 17, 2026, in scenic Somerville, MA. This cherished annual event celebrates the spectacular spring migration of river herring from Boston Harbor to the Mystic Lakes, offering runners a unique opportunity to connect with nature while supporting the vital work of the Mystic River Watershed Association. With typical race day conditions boasting comfortable highs around 68F and lows around 52F, and only a 15% chance of precipitation, you can expect pleasant weather for your run.

The 5K course offers a flat and fast experience, ideal for setting a personal best or enjoying a leisurely stroll. Runners will enjoy a picturesque route along the Mystic River bike path, winding through the verdant DCR Torbert MacDonald Park, all without the interruption of street crossings. Known for its community spirit and dedication to environmental preservation, the Mystic River Herring Run has been praised by participants as an "amazing race". All activities kick off from the DCR Blessing of the Bay Boathouse, the central hub for this vibrant event.

What truly sets this event apart is its integration into the larger Mystic River Herring Run and Paddle, making it a celebration of both land and water. Runners can even vie for the prestigious "Iron Herring Award" by completing both the 5K run and a paddling race. Beyond the race, participants can enjoy a free, family-friendly bike ride along the rivers or join a mobility class, enhancing the festive and inclusive atmosphere of this long-standing community tradition. This event is not just a race; it's a testament to the ongoing improvements and natural beauty of the Mystic River watershed, inviting everyone to be part of its story.