MOWSA helps swimmers challenge themselves and reach big goals in Massachusetts' waters.
MOWSA currently offers several solo, sanctioned swims that challenge marathon swimmers over long distances in cold water.
Bookings for 2025 swims are now open. Please visit the established swim pages for available dates or contact us for new routes and courses.
All solo swims scheduled for 2025 must be booked prior to May 15, 2025, as we need some time to organize the paperwork and planning for each swim.
| Swim | Distance | Solo Sanction Fee | Tandem Sanction Fee |
| Boston Light Double (BLSx2) | 16 miles | $750 | $975 |
| Around Nahant (@NHT) | 8.4 miles | $500 | $650 |
| Nantasket to Nahant (N2N) | 8.3 miles | $500 | $650 |
| Nantasket to Nahant Double (N2N2N) | 16.6 miles | $800 | $1,040 |
| Plymouth to Provincetown (P2P) | 19 miles | $950 | $1,235 |
| Mass Bay Crossing | 23 miles | $1,200 | $1,560 |
How it Works:
Understand the rules and risks. If you want to complete one of the established solo marathon swims we offer or another solo marathon swim in Massachusetts, please start by reading our rules and shark protocol.
Initiate contact with our team. Please fill out the short form below to let us know which swim you’re considering. One of our team members will get back to you with more specifics about which dates are available and will work with you on establishing your qualifications. If you want to attempt a new swim, we’ll use our local knowledge to design the route with you.
Contact a boat pilot. Swimmers must arrange boating support directly with the pilot and pilot fees are separate from MOWSA sanctioning fees. We are working to create a list of recommended pilots, but in the meanwhile, email us for a referral if you’re looking for a pilot.
Complete our application. Once we have outlined a plan for your swim, please fill out the form to finalize your intention to swim. We will supply an observer and organize any necessary Coast Guard and other permits from regulatory agencies.
Submit payment and finalize details. The sanction fee goes towards observer compensation, MOWSA administration, and our philanthropic efforts.
Achieve your goal!
Banner photo by Elaine K. Howley