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
September 1 thru October 31 – Fort* and Observatory open 9am to 5pm Fort* remains open until 6pm or sunset (whichever is earlier)
October 31 thru April 30 – Fort* and Observatory closed; Fort Grounds open daily 9:00 to sunset weather permitting.