In light of what happened on the "Rudy missed green blaze" ride, the following is prohibited on PA state game lands during hunting seasons. I also found out today that this will change next year. The last 2 weeks of spring turkey will be full day hunts, which means all trails will be closed to recreational mt biking for the entire day, except Sunday.
Prohibited:
"Ride a non-motorized vehicle, conveyance or animal from the last
Saturday in September until the third Saturday in January, and
prior to one hour after close of lawful shooting hours for spring
turkey season from the second Saturday in April through the last
Saturday in May, inclusive, except on Sundays or while lawfully
engaged in hunting, trapping or fishing."
Another way around it is to pack a weapon approved for turkey hunting, hunting license, and blaze orange while moving.