Wrap the cake tightly with plastic wrap. Ensure the sides, edges, and base are covered neatly and snug with plastic wrap for quality storing. Cakes made with butter will most likely last less than oil-based cakes. Keep the cake on a counter at room temperature. It should last for about week. Plastic wrap is not needed to store a frosted cake as the frosting is almost as a shield for the cake; it protects it from any air that floats like dust, pet hair, fuzz, and bacteria. Also, plastic wrap would mess up the frosting and mix together with the other frosting colors. Store your cake in a cake-keeper or flip a large bowl and cover it with that. It can last for about 4-5 days. If your frosting includes heavy cream (whipped cream topping) or a fruit filling like strawberry it must stay in the fridge in order to stay off from bacteria. Sliced cakes are a little difficult to store and can be tricky, however it is possible.  Remember as soon as you slice a cake, all the moisture leaves and it starts to become stale and hard. Try covering the cake with plastic wrap, especially the edges, to prevent that from happening. If you can, try applying frosting over the edges to protect any moisture from leaving. Sliced cake does not last for long, usually about 3-4 days. It doesn't matter if your cake is frosted, not frosted, sliced, and/or not sliced refrigerating is one of the best ways to store a birthday cake. It is recommended to do this during the hot seasons like spring or summer because a lot of heat and moisture can cause bacteria. For a cake that is not frosted, cover it well with plastic wrap. For a cake that is frosted, freeze the cake for about 15 minutes to let the frosting become a bit stiff. Your cake can last for about a week. When rooming your cake from the fridge, have it sit for about 10 minutes with room temperature or else it will be dry and dull. . If you want your cake to last longer than a week, freeze it. A well-covered cake that is stored properly can last for nearly a month. When removing your cake from the freezer, have it thaw using room temperature.
Store a cake that is not frosted or sliced. Store a cake that is frosted but not sliced. Store a cake that is sliced and includes frosting or doesn't. Consider refrigerating your birthday cake. Freeze the cake.