Matthew Weinstein, 23, of Mill River, Mass., became separated from caregiver Marius Louw and two other hikers, Fish and Game officials reported.
This happened at 1:30 p.m., when the group was descending the Summit Trail in Mount Sunapee State Park.
Weinstein’s companions searched for him for some two and a half hours before calling for help.
Fish and Game officers, Newbury Fire Department members and volunteers from the Upper Valley Wilderness Search and Rescue Team responded.
The impending storm and the fact that Weinstein is nonverbal added some urgency to the search, according to Fish and Game officials.
Weinstein finally was located, about five miles from his last known location by the Goshen fire chief. Weinstein was not injured.
Officials remind hikers to plan ahead, watch the weather forecast, stay together and dress appropriately.