Typically, I forage for mushrooms in the woods by my house in Westmoreland County, on the CONSOL property in Washington County, Ohiopyle trails in Fayette County, and a couple state parks in the Laurel Highlands in Somerset County. Maybe try some of the parks like Marine State Park, North Park, South Park, or Boyce Park. I will be interested in other redditor's suggestions for mushroom foraging in Allegheny County.