Any type of cake with cream cheese icing should always be refrigerated. Cream cheese is a dairy product that requires refrigeration.
Cream cheese icing can be kept in the refrigerator for up to 2 weeks if stored properly. The icing should be placed in an airtight container or sealed bag. Properly sealed cream cheese frosting can also be frozen and thawed in cool water or the refrigerator for future use.
Cream cheese frosting is made with soft cream cheese, vanilla extract, unsalted butter and powdered sugar. This type of icing is commonly used on carrot cake, but can be used on a variety of cakes, cupcakes and sweet breads as well.
Cream cheese is made with cow's milk and is relatively high in fat. It is classified as a soft cheese and an excellent source of protein.
Cream cheese is firm when cold but softens quickly when left at room temperature. Cream cheese icing should not be left at room temperature for more than 2 or 3 hours. After this time period bacteria can grow, which poses a risk of foodborne illness.
Cream cheese is available for purchase at most markets in the U.S. and also available in flavored varieties.