How Do You Know If Sour Cream Is Bad. A regular sour cream has a certain level of sourness. A spoiled sour cream will have a bad and bitter taste.
According to clemson university cooperative extension service, sour cream stays fresh for up to two weeks; According to eat by date, you should expect 1 to 2 weeks after the date on the package.
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After opening, sour cream keeps for one to two weeks with continuous refrigeration. All types of cream can curdle when they go bad, although you will first probably notice a sour odor.