The River Rat Race is a one-of-a-kind canoe racing event along the Millers River, beginning in Athol and concluding in Orange. With a strong current and hundreds of canoes, the race presents a challenge to even the most-seasoned of canoe racers who must maneuver through a myriad of novice tandems. Every year in April entrants of all ages and abilities make the eight-mile trek from Athol to Orange. The 58-year-old race also attracts racers from throughout the Northeast and across the country. The weekend-long festivities begin in Athol with the Big Cheese 5K, a family-friendly road race. Following the 5K is the annual parade known as the River Rat Promenade. The Race begins at 1PM.

Throughout the weekend, Athol also plays host to a carnival near the race-launch site, and Orange holds a celebration at Riverfront Park, the site of the finish line. Quite possibly the most popular event in the North Quabbin region, the River Rat Race is a fun time for families and people of all ages.