Fort Constitution Historic Site
Off NH Route 1B at US Coast Guard Station
25 Wentworth Road
New Castle, NH 03854
Fort Constitution State Historic Site is located on a peninsula on the northeast corner of New Castle Island. It overlooks both the Piscataqua River and the Atlantic Ocean. The grounds provide a casual gathering spot for picnics. In 1791, the State of New Hampshire gave the United States the neck of land on which Fort William and Mary and a lighthouse were situated. The fort was repaired, renamed Fort Constitution and garrisoned with a company of United States artillery. Renovations, which included a wall twice as high as that of the colonial fort and new brick buildings, were completed in 1808. It is the ruins of this fort that are seen today.
This park is unstaffed and open year-round for recreation. Should an emergency arise during your visit, please call 911 for assistance.
Are pets allowed at Fort Constitution State Historic Site?
Pets are not permitted in the park. See the NH State Parks Pets Policy for more information.
Keep Your Parks Clean
Through the Carry-In/Carry-Out Program, you can help us keep your parks clean and beautiful by carrying out whatever you carry in. Thank you for your cooperation and remember to recycle.
Access for Persons with Disabilities
Please contact the park office directly for information regarding disability access needs.
Fort Constitution Park History
A Military History of Fort Constitution (Fort William and Mary)
Fort Constitution 360 Panorama