The historic site says with no earned revenue, it was forced to lay off 40% of its staff, make salary cuts, and scale down programming.
Its popular Halloween fundraiser known as Terror Behind the Walls has also been suspended.
Eastern State says modifications to the haunted attraction to comply with COVID-19 guidelines would have presented significant operational challenges and financial risk.
The old prison turned museum says it still will reopen in mid-July.
A shift to smaller-scale evening tours is planned.