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May 15, 2013. The USDA says that butter is safe at room temperature, but if left out for several days may get a rancid flavor. They recommend leaving butter out for only a day or two. For more food safety information, see Smart Storage Strategies and Can Your Refrigerator Kill You?
Reply. Hi Ranecia! (I updated your autocorrect ;)) You can keep your buttercream for 2 days at room temperature, 10 days in the fridge sealed well to keep out off-tasting odors, or a couple of months in the freezer. If you rewhip when it is cold it will tend to separate so I like to bring it to room temperature first.i Ranecia! (I updated your autocorrect ;)) You can keep your buttercream for 2 days at room temperature, 10 days in the fridge sealed well to keep out off-tasting odors, or a couple of months in the freezer.