Fort Knox Historic Site and the Penobscot Narrows Observatory are


for the season 

Fort Knox, the Observatory, Fort grounds and restrooms are currently closed although the grounds are still open to the public. When on the grounds, visitors must to stay at least six feet away from other people not in your group. As necessary, please step aside when passing other people on stairs and walkways to maintain social distancing. Under current guidelines, gatherings of 100 or more are prohibited. Avoid touching signs, kiosks, buildings and benches to minimize the potential spread of the virus. If you are sick, please stay home: it puts others at risk when you leave home while exhibiting symptoms related to COVID-19 or if you have recently been exposed to the virus. 


The Friends of Fort Knox would like to thank everyone for their support as visitors, event attendees and donors helping us to operate, maintain and preserve the Fort Knox Historic Site for future generations!

Call 207-469-6553 or email for information!

The Fort Knox Historic Site features one of the best-preserved examples of coastal defense fortifications constructed in the mid-1800s.  It is America's first fort named after Major General Henry Knox. 

During the season (May 1st to October 31st: The Fort and Observatory are open from 9am to 6pm (7pm in July/August) unless otherwise posted at the gate. The grounds are open from 9am to sunset  Free interpretive guided tours provided by volunteers are available from 11am to 3pm.  Reservations for special events (weddings, family gatherings, reunions, business retreats) and group tours may be arranged by calling 207-469-6553 or


During the off season (November 1st to April 30th) Grounds are open from 9am to 4pm - weather dependent.

 The Penobscot Narrows Bridge Observatory (PNO) is normally open from 9am to 5pm (6pm in July/August) unless otherwise posted at the gate.  The PNO is the tallest bridge observatory open to the public in the world.  Visitors to the observatory ride Maine's fastest elevator up 420' feet for breathtaking 360 degree views of the Penobscot Bay area.

Please enjoy the slideshow below for a taste of what Fort Knox and the PNO have to offer!


Phone: 207-469-6553

740 Fort Knox Road, Prospect, Maine 04981


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