a Facebook post by DCNR (Dept of Conservation and Natural Resources) of Pennsylvania just announced that events, races, etc etc from March 13 to April 30 are cancelled.
Camping in campgrounds is allowed during that time
update: DCNR issued on Monday evening a more restrictive order, banning all camping (tent, RV, cabin, cottages, facilities) for two weeks until end of March.
hiking and use of trails still permitted.