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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.
Ff it's cultured (and not pasteurized again after being fermented) then it should last several days after the sell by date. This is usually what they sell as buttermilk. It should just become more sour as it ages, instead of the sudden putrid off smell that pasteurized milk has when it's past it's prime. Now, if it's actual buttermilk, ie, the milk leftover from making butter, it should be good for a day or two past the sell by date. Now, if it's acidified milk made to resemble buttermilk from making butter or cultured buttermilk... I have no idea. Trust YOUR senses.