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1 To freeze butter, wrap tightly in heavy-duty aluminum foil or plastic freezer wrap, or place inside a heavy-duty freezer bag. Frozen  salted butter will generally keep longer (up to 9 months for best quality) than unsalted butter (5-6 months for best quality).
Butter will generally last for about one month after the sell-by date on the package, assuming it has been continuously refrigerated. How long can butter be left out at room temperature? Butter may be kept at room temperature for 1 to 2 days, but it will begin to spoil rapidly if not refrigerated after that. To further extend the shelf life of butter, freeze it: to freeze butter, wrap tightly in heavy-duty aluminum foil or plastic freezer wrap, or place inside a heavy-duty freezer bag.