Jenny Jump State Forest
is a state park
in the U.S. state
of New Jersey
operated by the New Jersey Department of Environmental Protection
's Division of Parks and Forestry
. It is 4,239 acres (17 km²) in area, located in northwestern New Jersey, in northern Warren County
, south of Hope Township
, on the north flank of Jenny Jump Mountain
The park has extensive hiking trails on the mountainside, featuring large glacial boulders and outcroppings from the Wisconsin glaciation approximately 21,000 years ago.
It is said that the park was named after an Indian chasing a girl named Jenny, who jumped to her death on Jenny Jump Mountain.
The park grounds include the Greenwood Observatory
, built by the United Astronomy Clubs of New Jersey
(UACNJ) in 1995. The observatory
is open for public stargazing on Saturday nights April through October.
The park has camping facilities during the summer months.