how long is cream cheese good for once opened
âJ.F., Erie, Pennsylvania. According to Philadelphia Cream Cheese, under normal refrigerator conditions of 40Â° at all times, an unopened package of cream cheese is good 1 month past the Best When Purchased By date on the carton.Once opened, cream cheese should be used within 10 days.Advertise with us ADVERTISEMENT.ccording to Philadelphia Cream Cheese, under normal refrigerator conditions of 40Â° at all times, an unopened package of cream cheese is good 1 month past the Best When Purchased By date on the carton.