Money-Saving Storage Tip
Margarines will keep in the refrigerator, unopened, for 4-5 months. Once opened, they will keep for 1 month. Butter, however, should be used within a month. If you're not able to use the whole package in that time, then freeze it and pull out what you want as needed.
(Source: Land O’ Lakes consumer help line: 1-800-328-4155)