The iconic statue shut down last October to undergo interior renovations.
The repairs included wheelchair access to observation decks, a new air conditioning system, upgraded restrooms, along with improved fire suppression systems and elevators.
During that time, the stairs to the crown were also replaced and made less steep.
A Parks Service official said the renovations will have a significant impact on visitation, allowing an additional 26,000 people to visit the monument annually.
It is reported that about 3.5 million people visit New York's Statue of Liberty every year.
Incoming Hurricane Sandy is not swaying officials to delay the big day.
Lady Liberty's crown will reopen Sunday, rain or shine.
The Associated Press contributed to this report.