• Any person seeking admission to the Observation Tower must pay the “Fort and Observatory” admission fee.
  • Visa, Mastercard, American Express and Discover credit cards accepted.
  • State Park Season Passes and Senior Citizen Passes are not honored for admission to the Observation Tower, but do count toward admission to the Historic Site.
  • Group Exemption Guidelines do not apply to admission to the Observation Tower. School Group rates only apply to Maine schools from Sept-June.
  • National Park Senior Passes do not apply to Maine Historic Sites

Operation Hours
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
May-June, Sept-Oct.
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.