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 3 to 4 weeks in an airtight container. The squeeze tubes of decorating icing are an exception: these can stay in the pantry after opening because refrigeration makes them too stiff to pipe.
Homemade Frosting: The Type Determines Everything
The Key Distinction
American buttercream (butter and powdered sugar) is the most forgiving. The high sugar content and lack of perishable dairy beyond butter (which is itself shelf-stable at room temperature for short periods) means it can sit at room temperature for up to two days in a cool environment. America’s Test Kitchen confirms that a simple uncooked buttercream with just butter, sugar, and flavorings can sit out for a couple of days. Refrigerate it for up to two weeks. Freeze it for up to three months.
Cream cheese frosting is a different story entirely. The FDA advises refrigerating any food made with cream cheese after 2 hours, including the time spent making it. Cream cheese is a soft dairy product with significant moisture content, which makes it a food safety concern at room temperature. Refrigerate cream cheese frosting immediately and use within two weeks.
Whipped cream frosting is the most perishable. Fresh whipped cream begins to break down almost immediately at room temperature and should be refrigerated and consumed within 1 to 3 days.
Signs That Frosting Has Gone Bad
When to Throw It Out
Mold: Any visible mold growth, which can appear as fuzzy spots in any color, means discard the entire container immediately. Do not attempt to scoop around mold in frosting.
Off or sour smell: Fresh frosting should smell sweet, buttery, or like its flavoring. A sour, rancid, musty, or otherwise unpleasant smell means the frosting has gone bad. This is especially telling for cream cheese or whipped cream frostings.
Significant color change: Some darkening over time can be normal, but frosting that has turned a noticeably different color from when it was fresh indicates deterioration.
Separation or grainy texture: Some separation can occur in refrigerated frosting and can be corrected by re-whipping. Frosting that remains grainy or watery after re-whipping and has been stored a long time has likely gone off.
Off taste: Rancid butter produces a noticeably unpleasant flavor. If frosting tastes sour, bitter, or otherwise wrong, discard it.
Time: Regardless of appearance, discard cream cheese frosting after two weeks refrigerated, opened store-bought frosting after four weeks, and homemade buttercream after two weeks refrigerated. Do not rely solely on visual inspection for frosting that contains cream cheese.
Freezing Frosting: What Works and What Doesn’t
Most frostings freeze well except whipped cream. Buttercream and cream cheese frosting freeze up to three months. Transfer to an airtight freezer-safe container, press plastic wrap directly onto the surface of the frosting before sealing to prevent freezer burn, and label with the type and date. Thaw overnight in the refrigerator and bring to room temperature before re-whipping.
Whipped cream frosting does not freeze successfully. The air whipped into it collapses during freezing and thawing, leaving a watery, separated result. Make whipped cream frosting fresh and use it within days.
How to Store Frosting Properly
Storage Best Practices
Know your frosting type before deciding where to store it. Cream cheese and whipped cream frostings go in the fridge immediately. Buttercream can sit at room temperature briefly but does better refrigerated. Canned store-bought frosting is pantry-stable until opened.
See also
Use an airtight container. Frosting absorbs surrounding odors easily, especially in the refrigerator. An airtight container prevents the frosting from tasting like whatever else is in the fridge. Press plastic wrap directly onto the surface before sealing to prevent a crust from forming.
Label with type and date. Buttercream and cream cheese frosting look nearly identical once stored in a container. A label removes the guesswork about what it is and how long it has been there.
Do not store in a piping bag with the tip cut off. An open piping bag allows the frosting to dry out rapidly. Transfer unused frosting to a sealed container instead.
Bring refrigerated frosting to room temperature before using. Cold buttercream is stiff and difficult to spread. Remove it from the fridge 30 to 60 minutes before using. Re-whip if needed to restore a smooth, spreadable texture.
Recipes That Use Frosting
- Sugar-Free Cutout Cookies: classic royal icing turns these into the iconic decorated cookies perfect for any occasion
- Bunny Butt Cupcakes: buttercream frosting is piped into the fluffy white tail and grass that make these cupcakes
- Lavender Cookies: a simple glaze icing finishes these delicate cookies with a light, sweet coating
- No-Sugar Sugar Cookies: decorated with a sugar-free icing that works just like royal icing for beautiful cutout results
Frequently Asked Questions
Can I use store-bought frosting past its best-by date?
For unopened cans, yes, often well past it. Best-by dates on canned frosting indicate peak quality, not an instant safety cutoff. An unopened can stored properly in a cool, dark pantry that is a few months past its date is almost certainly still fine. Check for off smell, mold, or significant texture changes. If it looks and smells normal, it is safe to use. For opened frosting that has been refrigerated, use the smell and mold tests rather than the date as your primary guide, and discard it after four weeks regardless.
Does a frosted cake need to be refrigerated?
It depends on the frosting. A cake frosted with American buttercream (butter and powdered sugar) can sit at room temperature covered for up to two days in a cool environment. A cake frosted with cream cheese frosting should be refrigerated and brought back to room temperature before serving. A cake with whipped cream frosting must be refrigerated and served within a day or two. When refrigerating a frosted cake, loosely cover it to prevent the frosting from absorbing refrigerator odors and the cake from drying out.
My buttercream frosting has been in the fridge for three weeks. Is it still good?
If it is a plain American buttercream made with just butter and powdered sugar, it is probably borderline. The recommended refrigerator window is two weeks for best quality. Do the smell and taste test. If it smells fresh and buttery rather than rancid and tastes normal, it is likely still usable. If there is any off smell or taste, discard it. If the buttercream contains cream cheese, milk, or eggs, discard it at three weeks without question.
Further Reading
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