A 19-year-old girl is lucky to be alive after plunging five floors off a Queens rooftop early this morning, cops said.

The victim was hanging out with a pal on a building’s fire escape on 210th Street near 94th Avenue at about 2:00 a.m. when the pair decided to climb up to the roof, authorities said.

As the girl then started back down the fire escape, she lost her footing and fell, they said.

She was rushed to Jamaica Hospital but is expected to survive, cops said.