Is My Butter Bad?
What happens if you use unsalted butter that has been frozen for more than 12 months?
The recommended refrigerator time for unsalted butter is 3 months. The lack of salt also means lack of preserving powers. Freezing, however, lengthens the shelf life of any type of butter. You can store butter in the box inside ziplock bags for up to 1 year in a deep freeze and up to 4 months in a refrigerator/freezer unit. If you pull the butter out and it still smells/tastes good, you're okay to use it. You'll notice rancidity right away. You won't be even tempted to keep it if it has spoiled.
Hope this helps,
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