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1 When freezing a cake, be sure that it is completely cooled before wrapping. 2  Wrap the cake tightly in plastic wrap and then wrap it again in foil before placing it in the freezer. 3  If you do not have time to freeze the cake overnight, freezing it for 2 or 3 hours will help when it comes time to decorate it. Place the frosted cake on a solid flat surface that can be used to hold the cake when placed in the freezer, such as a cookie sheet, cake board, or cutting board. 2  Place the unwrapped cake in the freezer. 3  Freeze unwrapped until the frosting and decorations are frozen hard.
Second to this, go for a plastic bag with a zip-lock type seal. Store these wrapped cakes on the counter at room temperature, and they'll keep for about a week before starting to stale on you. Oil-based cakes tend to keep a day or two longer than butter-based ones. To keep cakes for longer than a week, try freezing them. â¢ Frosted and Un-Cut Cake - The frosting actually acts like plastic wrap here, protecting the cake from air and moisture in the environment. A frosted cake can be kept at room temperature for 4-5 days.