Boulder Brook Reservation Trail is a hiking, biking, and horse trail in Norfolk County and Middlesex County, Massachusetts. It is within Rocky Ledges, Boulder Brook Reservation, and Kelly Memorial Field. It is 1.1 miles long and begins at 155 feet altitude. Traveling the entire trail is 2.3 miles with a total elevation gain of 299 feet. Near the trailhead there are a wetland and a parking. Rocky Ledge (elevation 292 feet), the Rocky Ledges and Boulder Brook Reservation conservations, and the Fairy Rock stone can be seen along the trail. There is also a cliff along the trail. The trail ends near the Elephant Rock stone.