Fort Knox Historic Site and the 
Penobscot Narrows Bridge Observatory are 
both open for the season through October 31st, 2021!

Regular Operating Hours 

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May 1 thru June 30   - Fort* and Observatory open 9am to 5pm 

                                    Fort* remains open until 6pm                  

July 1 thru August 31- Fort * and Observatory open 9am to 6pm 

                                      Fort* remains open until 7pm                    

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September 1 thru October 31-  Fort* and Observatory open 9am to 5pm 

                                    Fort* remains open until 6pm                  

 Today, tomorrow, every day! Year round! Grounds open 9am to sunset

*Fort includes the Fort itself, grounds, gift shop & visitor/education center. 

Please visit the Events Pages for details on dates and activities!

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2021 Entrance Fees

Fort only entry: Children (5-11yo) - $2.50

- Maine Residents Adults (12-65) - $4.50, Seniors (65+) - Free,

- Nonresident adults - $6.50, Nonresident Seniors - $3.00

Fort and Observatory entry: Children (5-11yo) - $5.00

- Maine Resident Adults (12-65) - $7.00, Seniors (65+) - $2.50

- Nonresident adults - $9.00, Nonresident Seniors - $5.50

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Call 207-469-6553 or email for inquiries.  

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When you visit the Fort and Observatory be sure to stop in the Visitor Center and Gift Shop for snacks & souvenirs!