Check this out... Legal anytime with a license. :)
“COYOTES: No closed season. No limit. Outside of any big game season (deer, bear, elk and turkey), coyotes may be taken with a hunting license or a furtaker license, and without wearing orange. During any big game season, coyotes may be taken while lawfully hunting big game or with a furtaker license.”
https://www.pgc.pa.gov/HuntTrap/Law/Pages/SeasonsandBagLimits.aspx#.VsqRNflViko
Sounds very much like a bounty is needed to severely reduce the number of these vermin, just like their western cousins.