According to French's, “The product will generally maintain good flavor quality for two to three months after that date, if refrigerated. While refrigeration will help maintain flavor, it's not necessary to refrigerate if you prefer to consume your mustard at room temperature.

What condiments do not need to be refrigerated after opening?

Refrigeration not needed

Common condiments that don't require refrigeration include soy sauce, oyster sauce, fish sauce, honey and hot sauce. Feingold says vinegars and olive oil (stored in a cool, dark place) are pantry-bound; coconut oil is actually best kept out of the fridge since it hardens below room temperature.

Should mustard and ketchup be refrigerated?

Answer: Technically speaking, you don't have to store opened bottles of ketchup and mustard in the refrigerator. ... But it's a good idea all the same, since they will last much longer if you do, as condiment manufacturers like French's point out.