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1 How long does unopened sour cream last after the sell-by date? 2  Sour cream will generally keep for one to two weeks after the sell-by date on the package, assuming it has been continuously refrigerated; be sure that the temperature of your refrigerator remains at or below 40Â° Fahrenheit at all times.
Most sour creams have a âsell-byâ date. As long as the package stays unopened, the dairy product should be fine for about 2 weeks after that date. If it has an expiration date (instead of a âsell-byâ date), add a week to the expiration date. Once the package is opened, its contents should be fine for 1 to 2 weeks. Of course shelf life of sour milk depends on how and how long (if weâre talking about opened container of sour milk) it has been stored.