The icing on the cake isn’t simply for flavor or decoration. Icing also helps cakes stay fresh by sealing in moisture. This is especially true of heavy, butter-cream-based icings. Once the cake is cut, however, it can quickly grow stale unless it is wrapped and/or stored in the refrigerator.
Cakes Shelf Life
Fruit Cake- -2-3 months1 year
Cakes, prepared2-4 days- -2-3 months
Frozen Cake- -- -2-3 months
Cake Mix6-9 months- -- -
leftover cake- -2-4 days2-3 months
Boyer, Renee, and Julie McKinney. "Food Storage Guidelines for Consumers." Virginia Cooperative Extension (2009): n. pag. Web. 7 Dec 2009. "Food Storage Guidelines”

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