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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 that has been frozen can stay good for six to nine months. Butter that has gone bad has a pale appearance. Butter does not have to be refrigerated, but refrigeration extends its shelf life. Butter is made from cream or milk that is churned until it turns solid.