It is generally recommended to refrigerate a German Chocolate Cake, but whether it needs refrigeration depends on a few factors. The cake itself can be stored at room temperature for a day or two, especially if it has already been frosted. However, if the cake contains perishable ingredients such as custard or fresh fruit fillings, it is advisable to refrigerate the cake. This helps extend its shelf life and prevent spoilage. Additionally, the coconut pecan frosting used in German Chocolate Cakes contains dairy products like butter and evaporated milk, which can spoil if left at room temperature for too long. Hence, refrigerating the cake will help maintain its freshness and preserve its texture.