Little Brewster Island Beach Boston Open Water Swimming

Little Brewster Island sits as a rocky outer island in the Boston Harbor Islands National Recreation Area, home to Boston Light, one of only five remaining Coast Guard-staffed lighthouses in the United States. Access to the island requires boat transportation, with the beach serving primarily as the historic starting point for organized swimming events rather than daily casual swimming. The island’s remote location and rocky coastline create a dramatic setting for open water swimming.

The island’s exposed position in the outer harbor means swimmers face true ocean conditions including currents, swells, and changing weather patterns. Water temperatures remain cool throughout the summer, typical of open Massachusetts Bay waters. The challenging conditions and remote location make this suitable only for experienced open water swimmers with support boats. The historic lighthouse and dramatic rocky coastline create an iconic New England maritime setting for distance swimming.

Little Brewster Island serves as the starting point for the Boston Light Swim, an 8-mile non-wetsuit swim first run in 1907, making it one of America’s oldest open water swimming events. The challenging course from the island to the mainland tests swimmers’ endurance and ocean swimming skills. The Massachusetts Open Water Swimming Association organizes this historic swim, maintaining its century-old tradition while ensuring modern safety standards. The swim attracts experienced marathon swimmers from throughout New England and beyond who seek to test themselves in these historic waters.

Water quality information for Boston Harbor and Massachusetts Bay is available through the Massachusetts Water Resources Authority. The outer harbor’s location and water circulation typically provide excellent water quality. The Boston Light Swim represents a pinnacle achievement for New England open water swimmers, combining challenging ocean conditions with over a century of swimming history. This location embodies the adventurous spirit of traditional marathon swimming in cold, challenging waters.