There are a number of campgrounds in SE PA that are open all year according to the PA Campground Owners Association (PCOA).
Here's the link: http://pacamping.com/
Then, mouse over "FIND A CAMPGROUND
" for the drop down list, then mouse over "Search By Region
" for its drop down list and click on "Region 6 - Southeastern Pennsylvania
The dates of operation are displayed at the bottom of each campground's listing.
Good Luck! Hope it stops snowing here by then so you can at least find the rocks, much less the trail.