Refried beans stay good for two or three days if kept in a refrigerator. Once you have opened a can of refried beans, refrigerate the leftovers in a non-metal container.They will stay good for two...ompston Eric answered on 4/19/2014. Refried beans, a common part of Mexican cuisine, will keep in the refrigerator for two or three days before spoiling. Canned refried beans that have been opened should be used within two days of being refrigerated.