May-October - Historic Site Parking Lot Entrance and Grounds are open
9:00am to Sunset
Fort Interior closes to the public one hour after Observatory closes - May-June, Sept-Oct 6 P.M.
July-August - Fort Interior Closes to the public at 7 P.M.
Penobscot Narrows Observatory
9:00am - 5:00pm
9:00am - 6:00pm
Are pets welcome at Fort Knox and/or the Penobscot Narrows Observatory?
Pets (on a leash 4 feet or shorter) are welcome throughout the Fort, the Fort grounds, and the Visitor's Center. Pets are not allowed in the Penobscot Narrows Observatory and may not be left in a car unattended.