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You’ve just put the finishing touches on a cake and are unsure whether it should spend the night in the refrigerator. Or maybe you have leftover frosting and aren’t certain if it’s safe to leave in the cupboard or if it needs chilling. Should frosting be refrigerated?
The quick answer: It varies by type. Unopened cans of store-bought frosting can be stored in the pantry, but once opened, they need refrigeration. American buttercream made from butter and powdered sugar can remain at room temperature for up to two days. Cream cheese frosting must be refrigerated right away. Whipped cream frosting also requires immediate refrigeration and should be used within a few days. The specific kind of frosting you’re using determines how you should store it.
For a broader comparison of shelf lives for pantry staples and perishable foods, check out our Complete Food Storage Guide.
Key Takeaways
- Unopened store-bought canned frosting: safe in the pantry; no need to refrigerate.
- Opened store-bought canned frosting: must be refrigerated; use within 3–4 weeks.
- American buttercream (butter and powdered sugar): can be left at room temperature for up to 2 days; refrigerate for storage up to 2 weeks.
- Cream cheese frosting: refrigerate right away. FDA’s 2-hour rule applies. Consume within 2 weeks.
- Whipped cream frosting: refrigerate immediately. Best used within 1–3 days.
- A cake’s need for refrigeration depends on its frosting—not the cake itself.
The Quick Guide: Does Your Frosting Need the Fridge?
| Frosting Type | Refrigerate? | How Long It Lasts |
|---|---|---|
| Canned frosting (unopened) | No — store in a cool, dark pantry | 12 to 18 months |
| Canned frosting (opened) | Yes — refrigerate after opening | 3 to 4 weeks |
| American buttercream (butter + powdered sugar) | Not urgent — safe at room temp up to 2 days | 2 days room temp; 2 weeks refrigerated |
| Cream cheese frosting | Yes — refrigerate within 2 hours | Up to 2 weeks refrigerated |
| Whipped cream frosting | Yes — refrigerate immediately | 1 to 3 days refrigerated |
| Swiss or Italian meringue buttercream (egg whites) | Yes — refrigerate within 1–2 days | Up to 1 week refrigerated |
| Royal icing (fully dried on cookies) | No — airtight at room temp | Several weeks once fully dried |
Why Cream Cheese Frosting Always Needs the Fridge
The 2-Hour Rule Applies
Cream cheese is a soft dairy ingredient that holds a lot of moisture, which makes it unsafe to leave at room temperature. According to FDA guidelines, any food containing cream cheese should be refrigerated within 2 hours, and America’s Test Kitchen backs up that this rule applies to cream cheese frosting. The 2-hour limit even includes the time it takes to prepare the frosting.
This rule covers homemade cream cheese frosting, opened containers of store-bought cream cheese frosting, and any desserts topped with it. If you have a cake or cupcakes with cream cheese frosting for a party, be sure to place them back in the refrigerator after serving instead of leaving them out overnight.
Store cream cheese frosting in an airtight container in the fridge for up to two weeks. For easier spreading, let it sit at room temperature for 30 to 60 minutes before using, as it becomes quite firm when cold.
American Buttercream: The Exception to the Refrigeration Rule
Traditional American buttercream combines butter, powdered sugar, and flavor extract, making it the most stable homemade frosting for room temperature storage. Its high sugar ratio and low moisture content mean it can stay out in a cool room for up to two days. That’s why cakes with buttercream frosting are safe to keep out for a birthday or celebration.
The essential detail: this advice only applies to classic buttercream with no added milk, cream, eggs, or cream cheese. If your recipe includes any dairy or eggs, even in small amounts, the safe period at room temperature drops sharply. For buttercreams using milk, cream, or egg whites, treat them as perishable and refrigerate within two hours of preparation.
Store-Bought Canned Frosting: A Special Case
What the Labels Do and Don’t Say
Unopened containers of store-bought frosting, such as those from Betty Crocker or Pillsbury, are shelf-stable for 12 to 18 months due to their preservatives and high sugar content, making them safe to keep in your pantry until you’re ready to use them. No refrigeration required before opening.
After opening, however, leading brands advise refrigerating the frosting. In the fridge, opened canned frosting will last 3 to 4 weeks if kept tightly sealed. The exception is decorating icing in squeeze tubes, which can become too hard to use if refrigerated and is safe to store at room temperature after first use.
A note on commercial cream cheese frosting: Betty Crocker’s label says their cream cheese frosting keeps for up to 30 days in the fridge after opening, thanks to added stabilizers and preservatives. This is a longer window than for homemade versions, but always check for signs of spoilage before using, such as mold or an off scent.
Does a Frosted Cake Need to Be Refrigerated?
Follow the frosting’s storage rules for your cake:
If your cake is covered with American buttercream (just butter and powdered sugar), you can leave it at room temperature—as long as it will be eaten within two days. Store it covered and away from heat or sunlight. Refrigerating a buttercream cake for a short period can dry out the cake, so room temp is ideal for short-term storage.
Cakes topped with cream cheese frosting, whipped cream, or fresh fruit should always be refrigerated. Take them out 30 to 60 minutes before serving so the frosting softens and the cake warms to room temperature.
For cakes finished with Swiss or Italian meringue buttercream (which contains egg whites), refrigerate after letting them sit out for only one to two days.
Storing Leftover Frosting the Right Way
Storage Best Practices
Place frosting in a sealed, airtight container. Leaving leftover frosting in an open bowl will cause it to dry out and absorb other