How to Store Your Favorite Condiments, According to Food Safety Experts Pantry or refrigerator? Learn where you should keep your mayonnaise, ketchup, Worcestershire sauce, and other condiments. Everyone knows condiments have expiration dates, but there is often confusion about whether mustard, ketchup, Worcestershire sauce, and other condiments should be stored in the refrigerator or left at room temperature in the pantry. The answer varies depending on the condiment, so we turned to a food safety expert to find out more. Here's how and where to store everything from mustard and mayo to ketchup and fish sauce. Credit: Courtesy of Johner Images / GETTY IMAGES Argyris K. Magoulas, Office of Public Affairs and Consumer Education in the USDA's Food Safety and Inspection Service department Our Pantry Shopping List Has All the Essentials Home Cooks Need Mayonnaise According to a recent study, mayo is the most-used condiment in the U.S.—beating out ketchup—so you likely have at least one jar at home. You probably know that unopened mayonnaise does not need to be refrigerated (after all, it's not refrigerated when you buy it at the store). At home, unopened mayonnaise can be stored in the pantry for three to six months. Once you've opened a jar, you should always keep it in the fridge, and for no longer than two months, says Argyris K. Magoulas from the Office of Public Affairs and Consumer Education in the USDA's Food Safety and Inspection Service department. These guidelines strictly apply to store-bought, commercial products—not homemade, which spoil much more quickly. Ketchup The second-most popular condiment and an essential for fries, burgers, and so much more, ketchup that hasn't been opened can be stored in the pantry for one year. Opened, you'll want to keep ketchup in the fridge for up to six months. Mustard Unopened, mustard can be stored for one to two years in the pantry. Once you have opened it, store your mustard in the fridge where it will last for up to one year. That gives you plenty of time to spread it on sandwiches, serve with meat, add to a favorite vinaigrette dressing, and more. Hot Sauce Hot sauce is a must in everything from red beans and rice to wings. Many hot sauces are vinegar based and have a long shelf life, lasting unopened for two to three years. Once opened, most hot sauces should be stored in the fridge and used within a year. (It will usually state on the packaging if the hot sauce needs to be refrigerated or not.) Soy Sauce Unopened, soy sauce may be stored for up to three years in the pantry. After it's been opened, store your soy sauce in the refrigerator, and plan to replace it after one month says Magoulas. How Long Is an Unopened Bottle of Rosè Good For? Barbecue Sauce If it hasn't been opened, your favorite jar of barbecue sauce can be stored in the pantry for up to one year. After it has been opened, it should be stored for up to four months in the refrigerator—but we assume you'll use it up much faster than that. Chili Sauce Similar to ketchup when it comes to safe storage, chili sauce that hasn't been opened can be stored in the pantry for one year. After opening you should keep it in the refrigerator for up to six months, according to the USDA. Jarred Horseradish Unopened, you can store jarred horseradish in the fridge for up to one year. Once it's been opened, you should keep it in the refrigerator for just three to four months. Vinegar Vinegar has a long, stable shelf life and is a condiment that does not require refrigeration. Whether it's unopened or opened, you can store vinegar in the pantry for two years. Worcestershire Sauce Like vinegar, Worcestershire sauce does not need to be refrigerated. Whether unopened or open it can be stored in the pantry for two years. Fish Sauce This umami-packed condiment is like Worcestershire sauce in that it does not require refrigeration. In fact, storing it in the refrigerator will cause salt crystals to form over time. Fish sauce can be stored unopened or opened in the pantry for two to three years. Explore more: Food & Cooking Cooking How-Tos & Techniques Food Storage