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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.
1 The exact answer to the question âHow long does an unopened package of sour cream last?â depends to a large extent on storage conditions â to maximize the shelf life of sour cream, keep it refrigerated at all times.  How long does unopened sour cream last after the sell-by date? 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.