Yes! I love keeping a stash of ready-made cupcakes in the freezer. That way I can just defrost them before guests arrive and whip up a batch of frosting at the last minute. To freeze the cupcakes, cool completely and then place them in a large freezer bag or container and freeze flat for up to 30 days. Defrost overnight in the refrigerator or leave out at room temperature for an hour before frosting.