Beans do not keep well. If kept in an airtight container, they will stay fresh for about 3 days. They will keep for 2 weeks if frozen.
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Smell is obvious, husband had a gray refried bean burrito and got deathly sick. Refried beans should not be gray but a darker shade of brown.
An unopened can of refried beans can be stored in the pantry 2 to 5 years. Opened beans should not be kept longer than 2-3 days in the refrigerator.