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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.
Shelf Life Of Sour Cream. When it comes to shelf life of source cream, there are many different opinions. Letâs start with the safest estimates. 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.