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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).
The shelf life of butter is about 6 to 9 months beyond the printed date depending upon a variety of factors such as the production method, its Best By Date and how it is stored.Butter is a dairy product made by churning fresh cream or milk until it reaches a solid form. An unopened container should last for 1-3 months at 40Â°F or less in the refrigerator, but some companies guarantee their product for up to 6 months. 2  If left in its partially-open original paper wrap, the exposed area stick butter will begin to harden and smell stale after about a week, as oxygen sets in.