Activity South Boston & Castle Island
L Street Brownies New Year's Day Plunge
An activity in South Boston & Castle Island, free to visit and worth about an hour. Best time to go: Late morning.
Why go
South Boston's swim club has run into the harbor every Jan 1 since 1904, with about 500 swimmers in 2026.
It is one of 6 curated places we feature in South Boston & Castle Island, alongside 2 outdoor spots, 2 sights and 1 place to eat. The closest of our other picks is Pleasure Bay loop, 0.6 mi away as the crow flies.
- Type
- Activity · Adventure
- Neighborhood
- South Boston
- Price
- Free
- Time needed
- 1 hr
- Best time
- Late morning
Nearby
Our closest curated picks, including 1 beyond South Boston & Castle Island. Distances are straight-line, not walking or driving.
- 1Pleasure Bay loop
Paved causeway path of about two miles around Pleasure Bay, from Day Boulevard out to Castle Island.
Outdoors · 0.6 mi straight-line - 2Dorchester Heights
Hilltop monument where Washington's cannon forced the British out of Boston in March 1776.
Sight · 0.8 mi straight-line - 3Carson Beach
Long harbor beach along Day Boulevard, with the Harborwalk running from Columbia Point toward Castle Island.
Outdoors · 0.9 mi straight-line - 4Lincoln Tavern & Restaurant
Busy neighborhood restaurant on West Broadway, known for its weekend brunch.
Food · 0.9 mi straight-line - 5Castle Island
Harbor-mouth park around Fort Independence, a granite fort of the 1830s, joined to South Boston by a causeway.
Sight · 1.2 mi straight-line - 6Long Wharf
Historic wharf on the downtown waterfront and the main viewing point for the midnight fireworks over the harbor.
Sight · Downtown Boston & the Waterfront · 2.3 mi straight-line
On these curated routes
L Street Brownies New Year's Day Plunge is a stop on our Boston New Year's Eve route. Open it to see the full day-by-day plan.
When to go: weather by month, based on Boston
Our climate figures for South Boston & Castle Island come from nearby Boston. Average daily highs in Boston run from 34°F in January to 82°F in July; October is usually the wettest month. For L Street Brownies New Year's Day Plunge itself, we suggest: Late morning.
Modelled monthly averages for Boston from NASA POWER, not a forecast. Boston weather by month (covers South Boston & Castle Island).
Getting there
Map links open a live search for L Street Brownies New Year's Day Plunge, so hours and directions come straight from the map app.
- Coordinates
- 42.33019, -71.03145
- Destination
- South Boston & Castle Island, Massachusetts
L Street Brownies New Year's Day Plunge: quick answers
How much time do you need at L Street Brownies New Year's Day Plunge?
Plan on about an hour at L Street Brownies New Year's Day Plunge. That is our curated estimate for a typical visit; groups that linger will want more.
When is the best time to visit L Street Brownies New Year's Day Plunge?
Our pick: Late morning. Insider tip: Plunging is for club members; watch from the beach by the Curley Community Center.
Is L Street Brownies New Year's Day Plunge free?
Yes, we list L Street Brownies New Year's Day Plunge as free to visit. Check locally before you go, since special exhibits, parking or tours can carry a fee.
Which TripsCircle routes include L Street Brownies New Year's Day Plunge?
L Street Brownies New Year's Day Plunge appears on Boston New Year's Eve, a curated route you can open on TripsCircle and plan with your group.
Add it to your crew's plan
Save it to a shared TripsCircle itinerary, settle the timing with a quick poll, and split the costs with everyone going to South Boston & Castle Island.
Plan South Boston & Castle Island
- South Boston & Castle Island travel guide 6 places
- Boston weather (covers South Boston & Castle Island) weather by month
Lists & regions
Curated recommendation, not live listing data. Confirm hours, prices, bookings and access before you go.