REFRIGERATE IT: Yes
AT FRESHEST: Opened, about 3 weeks; unopened, 2 months; freezer, up to 9 months
OPTIMAL STORAGE: Keep reserves in the freezer. Butter can be kept at room temperature if it will be used up within several days, but only if kept out of the light. If used only occasionally, store in the refrigerator in its original packaging and in the cooler parts of the refrigerator (the top and middle shelves near the back). Butter readily absorbs strong odors and flavors from its surroundings; additional wrapping or storing in a closed container (bag or butter dish) can help prevent this.
Clarified butter or “ghee” keeps three times longer than other butters because the milk solids (which cause butter rancidity) have been removed. Clarified butter is good for cooking but not for use as a spread. It will keep, covered, in the refrigerator for up to 3 months.
FREEZING: For the best results, freeze fresh butter in its original carton within a zip-top freezer bag.
USE IT UP/REVIVAL: The translucent dark yellow patches on the surface of butter are simply spots that have been exposed to air and dried out. Eat them or scrape off.
Save butter wrappers to grease pans or separate homemade burger patties. Store each wrapper, folded onto itself, in the freezer in an airtight container, and use as needed.