It is located in northern Warren County in the northwestern section of New Jersey, on the 1,112-foot (339 m) high, 6-mile (10 km) long Jenny Jump Mountain ridge.

The park has extensive hiking trails on the mountainside, featuring large glacial boulders and outcroppings from the Wisconsin glaciation approximately 21,000 years ago.

[3] 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 area is used by many amateur astro photographers as Jenny Jump has some of the darkest skies in New Jersey.