Protesters marched early Friday from the library to Chancellor Marye Anne Fox's front lawn chanting, "No more cuts."
N.C. State student government officials also organized a "Get Out the Vote" rally Tuesday to encourage students to vote against legislators who don't adequately support higher education.
N.C. State administrators said library hours were the last thing to be cut from the budget.
"It seemed logical at the time," said Nancy Vaupel, assistant director for scholarly communication and external relations at D.H. Hill Library.
Fox said the library hours were restored because the administration has a larger say in the recent budget proposal.
"We have been working in a vacuum in terms of a budget," she said. "The main thing was we finally had some influence on what was cut from our budget.
"We were encouraged that the budget in appropriations would give us enough flexibility to restore the 24-hour status of the library."
But Vaupel said there is still no funding that would enable the library to stay open late -- additional staff and security guards are needed to ensure the safety of students.
"We are somehow going to find the money to do this," she said. "Clearly there is going to be some sort of tradeoff.