Swim Across the Sound Marathon

What began 37 years ago when three Boston College graduates swam across the Sound and raised $5,000, has grown into a series of events, raising more than $1 million annually.

August 2, 2025

The Swim Marathon has seen upwards of 190 swimmers and 100 boaters participate in this one day swimming event from Whitehall Beach in Port Jefferson, NY to Captain’s Cove Seaport in Bridgeport, CT. The journey measures 25 kilometers (15.5 miles) and can take anywhere from 5.5 hours to over 10 hours to complete. It’s truly an amazing accomplishment for a wonderful cause!

Event Details

Helpful Links

2024 Swim Across the Sound

We are listed as one of the Top 100 Open Water Swims with the World Open Water Swimming Association!!

Celebrating 38 years on August 2, 2025

A Fundraising Event

By obtaining donations, swimmers help Swim Across the Sound raise funds to provide cancer patients and their families with programs and support. Thanks to the swimmers, boaters, donors and event sponsors, the Swim is able to assist these families at a time when they need to focus on their health and well-being.

For swimmers who may need fundraising support, please call 475-210-7308.

For the Public

Members of the public are invited to join the fun at Captain’s Cove, located at One Bostwick Avenue in the historic Black Rock section of Bridgeport, and cheer on the swimmers as they cross the finish line.

As the swimmers finish, Captain’s Cove Seaport is alive with music, entertainment and a children’s activity area; the boardwalk shops and restaurant will also be open. The swimmers start to arrive at the finish at approximately 2:30 p.m., depending on the weather, and will continue crossing the finish line until 6:30 p.m. An awards ceremony takes place shortly after all the swimmers have arrived at Captain’s Cove.

For more information about how you can get involved, please call 203-576-5451.

Donate To The Swim Marathon

Saturday, August 2, 2025

Boat Owners Needed

We need power and sailboats for the Swim from Port Jefferson, NY to Captain’s Cove Seaport, Bridgeport, CT

Motor or Sail Boats need to be 20’ and up
Free dockage available at Port Jefferson on Friday, August 1, and at Captain’s Cove Seaport on Saturday, August 2, by request and subject to availability
Free Captain’s Cocktail Reception at Danford’s on Friday, August 1st
Entry into the Post Event party at Captain’s Cove Seaport following the marathon included
Some expenses may be tax deductible

To register or volunteer, call 203-576-5451 or sign up below.

Boat Owner Sign-Up Here

Health & Safety Notice

Your health and safety and that of our community remain to be our top priority.
We ask that if you have any symptoms suggestive of COVID-19 or any other infectious virus prior to the event please do not attend.