Having a can of Spam in your pantry is convenient as it can be used to make simple dishes or added to instant ramen. Unopened cans can last up to three years. Once opened, store it covered in the fridge for four to five days. If taken out of the can, transfer it to an airtight container or wrap it in plastic wrap. For longer storage, freeze it by slicing it into portions, individually wrapping them, and storing in freezer-safe bags. Frozen Spam can remain good to eat for up to three months.