Boating & Marinas


Marinas & Boat Yard

There are three marinas; Byram, Cos Cob, and Grass Island as well as one boat yard at Greenwich Point. All three marinas and the boat yard have landing floats and launching ramps available to use with a valid Facility Use Permit. These facilities are open April 15 through November 15 each year. 

Winter storage is available at all 3 marinas and the boat yard from September 1 through June 15. Email the Marine Division at or speak to the Dockmaster if you are interested in storing for the winter. Space and vessel size is limited; current boaters have preference.


We provide a host of services which meet the active boater’s needs (verification of residency required). Please be advised that some services have wait lists. 


If you are interested in a mooring for a location within the Town of Greenwich, or if you need to renew your current mooring, you will need to complete a mooring application. You can download the application from the Greenwich Harbor Management Commission website. If you have questions, contact their office at 203-622-2259. 

Visitors / Transits

Our Grass Island Marina in Greenwich Harbor has tie-up space for visitors and transients. There is no fee for the first 2 hours. Fees apply after two hours or overnight. Fees are based upon vessel size. Call the boating office at Town Hall, 203-618-7651 or the Grass Island Dockmaster at 203-618-9695 or 203-496-1255 to obtain more information or to make a reservation.

Power Wash Schedule

2023 Schedule (PDF)