The length of time you can leave a cake out unrefrigerated depends on several factors, including the ingredients, the frosting or filling used, and the environmental conditions. Generally, most cakes can be kept at room temperature for a short period, typically 1 to 3 days. However, it's important to consider the following points:
Ingredients: Cakes with perishable ingredients like fresh fruit, cream, custard, or mousse are more prone to spoilage and should be refrigerated. These types of cakes have a shorter shelf life at room temperature, typically around 1 to 2 days.
Frosting or filling: Cakes with buttercream, cream cheese frosting, or other dairy-based fillings can become unsafe to consume if left at room temperature for too long. If your cake has a perishable frosting or filling, it's best to refrigerate it.
Environmental conditions: High temperatures and humidity can accelerate spoilage, so if you're in a hot and humid climate, it's generally safer to refrigerate the cake sooner.
To extend the shelf life of your cake, you can store it in the refrigerator. Properly stored, a refrigerated cake can usually last for 4 to 7 days. If you need to keep the cake for a longer period, you can also freeze it. When properly wrapped and stored in the freezer, cakes can maintain their quality for several months.
Remember to use your judgment and consider the specific ingredients and conditions when determining how long to leave a cake out unrefrigerated. If you're unsure, it's best to err on the side of caution and refrigerate the cake to ensure its freshness and safety.