There is an open can of frosting in the cabinet that has been there for a few weeks, or a bowl of homemade buttercream from last weekend still sitting in the fridge. Does frosting go bad?
The short answer: Yes, but how fast depends entirely on the type.
An unopened can of store-bought frosting lasts up to 18 months in the pantry. Homemade cream cheese frosting should be refrigerated immediately and used within two weeks. Buttercream made with only butter and powdered sugar can sit at room temperature for two days. The type of frosting determines everything about how you should store it.
For a full overview of how pantry staples and perishable foods compare on shelf life, visit our Complete Food Storage Guide.
Key Takeaways
Store-bought canned frosting (unopened): 12 to 18 months pantry-stable.
Store-bought canned frosting (opened): refrigerate and use within 3 to 4 weeks.
Homemade American buttercream (butter and powdered sugar only): up to 2 days room temperature; 2 weeks refrigerated; 3 months frozen.
Cream cheese frosting: refrigerate immediately. Use within 2 weeks. The FDA 2-hour room temperature rule applies.
Whipped cream frosting: refrigerate immediately. Use within 1 to 3 days.
Royal icing (fully dried): shelf-stable for weeks at room temperature once set.
How Long Does Frosting Last by Type?
The single most important factor in frosting shelf life is whether it contains perishable dairy like cream cheese, fresh whipped cream, or eggs. Those ingredients determine whether frosting belongs in the fridge immediately or can safely sit out for a day or two.
Frosting Type
Room Temperature
Refrigerator
Freezer
Store-bought canned (unopened)
12 to 18 months pantry
Not needed
Up to 3 months
Store-bought canned (opened)
2 hours max
3 to 4 weeks
Up to 3 months
American buttercream (butter + powdered sugar)
Up to 2 days
2 weeks
Up to 3 months
Cream cheese frosting
2 hours max
Up to 2 weeks
Up to 3 months
Whipped cream frosting
1 to 2 hours max
1 to 3 days
Not recommended
Swiss or Italian meringue buttercream (egg whites)
1 to 2 days
Up to 1 week
Up to 3 months
Royal icing (fully set and dry)
Several weeks airtight
Not needed once set
Not recommended
Estimates based on proper storage in sealed airtight containers. Best-by dates on commercial products indicate peak quality, not safety cutoffs. Always check for spoilage signs before using. Consistent with USDA FoodKeeper guidelines for dairy-containing prepared foods.
Store-Bought Canned Frosting: Pantry Until Opened, Fridge After
Unopened cans of Betty Crocker, Pillsbury, and similar brands are shelf-stable thanks to high sugar content and preservatives like potassium sorbate. They can sit in a cool, dark pantry for 12 to 18 months without refrigeration. Once opened, the rules change. Exposure to air increases spoilage risk and the manufacturer’s recommendation on every major brand is to refrigerate after opening. Opened store-bought frosting keeps in the refrigerator for
