There are no hard and fast rules about the length of time corned beef will keep. That will depend upon several factors including
# the recipe/formulation # the packaging used # the handling of the corned beef from production through distribution to the store and by the consumer
# the actual conditions of storage - especially temperature and temperature fluctuations
Most of the information we have available are just guidelines. So use those and a bit of good sense.
If the package is unopened and your refrigeration is 40°F or less (check with a thermometer), use the manufacturer's date on the package.
If it is opened, plan to use it within 5-7 days.
If it is frozen, plan to use it within one month.
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This food will keep for about 5 days in the refrigerator. Place the food in an air tight container for best results. It can later be transferred to the freezer for longer storage.
the USDA says you can freeze uncooked corned beef for up to 1 month (drain the liquid first) or cooked corned beef for 2 to 3 months.
Meats are kept better in the freezer. Meats can be kept in the refrigerator for 3 to 4 days if raw and 1 to 2 days longer if cooked. Always place cooked meats in an airtight container.
Cooked corned beef can be kept in the refrigerator for up to three days. The corned beef needs to be kept in an airtight container.
If you place it in the freezer in a container it should be good for some months.
If it's sealed, it'll last a while... a month or more. Even unsealed, it will last longer than regular beef because it is brined.