Place the fudge in an airtight container for up to two weeks in a cool and dry place, away from direct sunlight or on the countertop. If you want to keep the fudge for up to three weeks, you can store it in the refrigerator in an airtight container. Freeze the fudge for three months in an airtight container. Make sure to wrap it well and seal it tightly, as the fudge can lose moisture and become dry in the freezer.