How long does butter last?
Unopened butter stored in the refrigerator at 32-38º F keeps for 4 months, while opened butter keeps only a couple of weeks.
| Form | Where | Official window |
|---|---|---|
| unopened | refrigerator | 4 months |
| opened | refrigerator | a couple of weeks |
| salted butter in a covered dish or butter crock | room temperature | up to one to two days |
The official discard rule
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These are the official windows; when in doubt, follow the source linked below.
Grounded in: extension.oregonstate.edu, extension.umaine.edu. Every window above appears
verbatim in the linked sources.
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