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How Long Can Mayonnaise Be Left Out of the Fridge?

Question: How long can I let an opened jar of mayonnaise sit out of the refrigerator before it becomes unsafe to eat?

Answer: You can let an opened jar of mayonnaise sit out at room temperature for up to 8 hours, says the United States Department of Agriculture. Opened mayonnaise that has been held above 50 degrees Fahrenheit for more than 8 hours should be discarded.

An opened jar of mayonnaise that has been continuously refrigerated, on the other hand, will generally maintain best quality for 2 to 3 months after the “best by” date on the package.

See Also:

Do You Have to Refrigerate Opened Bottles of Mustard and Ketchup?

Do You Have to Refrigerate Peanut Butter

 

 


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