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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).
How long does butter last in the freezer? Frozen salted butter will generally maintain best quality for about 9 months, while unsalted butter will stay at peak quality for about 6 months; in both cases, the butter will remain safe beyond those times.