A slightly rocky stretch of Day Boulevard shoreline between Carson Beach and Castle Island, more suited to walking and sunbathing on the grassy strip along the sea wall than to swimming given the rockier bottom. A $2 million renovation added new plantings and an improved sea wall.
What to expect
Swimming
Allowed water tested by the state
Accessible
Wheelchair access noted
Managed by
Massachusetts Department of Conservation and Recreation (DCR), South Region
WebsiteGetting in
Parking
Parking not sourced yet
Check the town's beach pages before you go.
Access points along this beach
Murphy Rink access
Day Boulevard side
Sailing Center access
Castle Island side, near the Harry McDonough Sailing Center
What's here
Facilities
Restrooms
Murphy Rink (Day Boulevard side); Near Sullivan's / Harry McDonough Sailing Center (Castle Island side)
Common questions
Is M Street Beach @ M Street in Boston open today?
Open, no advisory on record in the latest MA DPH posting (updated 2026-07-16). MA DPH is the authority. Check the status the morning you go.
Are there restrooms at M Street Beach @ M Street?
Public restrooms are listed near the beach. Seasonal hours are common, so they may be closed off-season.
What rules should I know at M Street Beach @ M Street?
Shoreline is slightly rocky, footwear recommended for swimming.
Been here? Help keep it current.
Prices, hours, and facilities change. A quick note keeps the next visitor from guessing.