The name 'Jenny Jump' is derived from a local legend regarding a girl named Jenny who was told to 'jump' by her mother to escape a group of Indigenous people during the colonial era.
The forest is situated on a unique geologic feature known as the Jenny Jump Mountain range, a distinct ridge of the Appalachian chain.
The UACNJ operates a public observatory within the park boundaries, offering specialized astronomical viewing sessions.
The area contains glacial erratics—massive, non-native boulders transported and deposited by ancient ice sheets.
Jenny Jump State Forest is located on a ridge in Warren County, New Jersey, reaching elevations of approximately 1,100 feet. The park is managed by the New Jersey Division of Parks and Forestry and encompasses over 4,000 acres of protected woodland. It is notable for the presence of the United Astronomy Clubs of New Jersey (UACNJ) observatory, which conducts public programs on-site. The terrain features glacial deposits, including large granite boulders left by receding glaciers. Recreational infrastructure includes a variety of hiking trails, ranging from moderate forest paths to steeper inclines leading to ridge-top overlooks. Camping facilities are available, offering tent sites and cabin rentals during the operating season. The forest provides a habitat for diverse local wildlife, including black bears and various migratory birds.
The overlooks along the Summit Trail providing views of the surrounding farmland and the Delaware Water Gap.
Bring high-quality insect repellent, as the forest is known for high tick populations.
Check the UACNJ website for their specific evening program schedule before visiting if you are interested in astronomy.
Wear sturdy, broken-in hiking boots, as the trails contain rocky and uneven terrain.
Attempting to access unmarked paths, as the ridge terrain can be deceptive and prone to loose rock.
Campgrounds and cabin rentals are seasonal and typically closed during the winter months.
Practice Leave No Trace principles; keep dogs on a leash at all times; do not disturb the local wildlife.
