Discover America's Original Fort Knox - Prospect, Maine
Regular Operating Hours:
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May 1 thru June 30 - Fort Knox Historic Site* and Observatory open from 9 am to 5 pm - Fort itself remains open until 6 pm
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July 1 thru August 31 - Fort Knox Historic Site* and Observatory open from 9 am to 6 pm - Fort itself remains open until 7 pm
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September 1 thru October 31 - Fort Knox Historic Site* and Observatory open from 9 am to 5 pm - Fort itself remains open until 6 pm or sunset (whichever is earlier)
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November 1 thru April 30 - Fort Knox Historic Site* and Observatory are closed. However, the park grounds are open 9 am to sunset.
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Park grounds are open from 9 am to sunset — today, tomorrow, and every day - Year-round (weather depending)! ​
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*Fort Knox Historic Site includes the Fort, Observatory and amenities like the gift shop & guest education/museum center.
Please visit the Events Pages for dates and details of additional activities like Civil War Days!
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2025
Entrance Fees
(updated April 25, 2025)
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Fort & Park Only entry:​
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Maine Resident Adults (12 - 65yrs) - $4.50
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Maine Resident Seniors (65+ yrs) - Free
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Nonresident Adults - $6.50
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Nonresident Seniors - $3.00
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Children (5 - 11yrs) - $2.50
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Fort & Park entry plus Observatory Elevator Ticket:
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Maine Resident Adults (12 - 65yrs) - $7.50
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Maine Resident Seniors (65+ yrs) - $3.00
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Nonresident Adults - $9.50
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Nonresident Seniors - $6.00
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Children (5 - 11yrs) - $5.50
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Park Admission & Observatory tickets can ONLY be purchased on-site at the Fort Knox's gate booth upon entry. No on-llne tickets available!