Even Mustard doesn’t Need to be Refrigerated When Stored Properly.
You don’t need to keep your mustard in the refrigerator in order to enjoy it at room temperature, according to French’s, the company that makes yellow mustard. Ketchup is another condiment that does not need to be stored in the refrigerator.
Mustard can be kept at room temperature for up to two years. If you need it to last longer than the expiration date, you can store it in the refrigerator. However, lowering the temperature is not required to maintain the flavor and texture of the mustard.