Boating & Marinas

Non-Resident Launch Permit Update:

We will begin accepting Non-Resident Launch Permit applications in person on Thursday, July 9, 2020 at the GRASS ISLAND MARINA from 9 a.m. to 11 a.m.  Due to restrictions, please ensure that you have copies of the following:

1. Vessel Registration

2. Vessel Insurance of a minimum of $300,000 liability coverage

3. Identification that has your address as listed on the vessel registration and insurance

Please note, during this time frame on July 9th we will only be accepting payment via CASH or CHECK.  Only fully completed applications will be accepted.  

Thursday, July 9 is the only day that we will accept in-person applications.  If you are unable to attend on that date, you may mail in completed applications including payment by CHECK ONLY.  Only completed applications with a CHECK payment will be accepted.  Applications will be taken on a first come, first serve basis.  

You can download and complete the application form prior to your visit by clicking on the following:

Cos Cob Marina Non-Resident Permit Application (PDF)       

Grass Island Marina Non-Resident Permit Application (PDF)    

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.


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 203-622-7713. 

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

2019 Schedule