Summer: Beginning Memorial Day and continuing through Labor Day, the tower is open from 9:00 a.m. to 8:00 p.m., Monday through Saturday, except Thursdays when the tower closes at 7:00 p.m. for bell ringing practice. On Sundays and Federal Holidays, the tower is open from 12 noon to 6:00 p.m.

Last tours go up fifteen minutes before closing.  

Winter: From Labor Day to Memorial Day, the tower is open from 9:00 a.m. to 5:00 p.m., Monday through Saturday. On Sundays and Federal Holidays, the tower is open from 10:00 a.m. to 6:00 p.m. The tower will be closed on Thanksgiving, Christmas, and New Years Days.

Last tours go up fifteen minutes before closing.  

Self Guided Tours begin approximately every five minutes from the elevator lobby on the stage level of the Old Post Office Pavilion. Visitors board the glass elevator to the exhibit area and then follow the signs to gain access to the 270 Level. The Observation Deck is exposed to the elements and possibly may be closed during inclement weather.