From my brief internet search, it appears feeding deer is not currently illegal in PA, but I am unfamiliar with the PGC and how to navigate their information. Following are a couple quotes from the linked web page. One would think if anything had happened since all the meetings in 2019, it would be published on this page, but again, I am not familiar with them or how they disseminate information. It is very clear they have concerns about feeding deer and do not want it done.
“There is broad support from the Advisory Committee to extend the current regulations prohibiting feeding of bear and elk to include deer and turkey. There was little support from the Advisory Committee members to ban the feeding of all wildlife, primarily because of the wide use of bird feeders. Expanding the feeding ban to include all big game would address some of the concerns related to wildlife feeding, while allowing for limited feeding of birds.”
”
(Proposed language)
137.33 Feeding of certain wildlife prohibited.
It is unlawful to intentionally lay or place food, fruit, hay, grain, chemical, salt or other minerals anywhere in this Commonwealth for the purpose of feeding big game to include Elk, Deer, Bear and Turkey, or to intentionally lay or place food, fruit, hay, grain, chemical, salt or other minerals that may cause big game to congregate or habituate an area. If otherwise lawful feeding is attracting big game, the Commission may provide written notice prohibiting the activity.”
https://www.pgc.pa.gov/Wildlife/Wildlife-RelatedDiseases/Pages/Please-Don't-Feed.aspx
EDIT:
Feeding deer is prohibited in some areas.
”Within
DMAs, rehabilitation of cervids (deer, elk and moose); the use or possession of cervid urine-based attractants in an outdoor setting; the removal of
high-risk cervid parts; and the feeding of wild, free-ranging cervids are prohibited.”
Chronic Wasting Disease
www.pgc.pa.gov