Harder cheeses like cheddar or gouda have a longer shelf life because it’s more difficult for bacteria and mold to permeate them. Once opened, hard cheeses may last up to six months in the refrigerator, according to the Academy of Nutrition and Dietetics. However, softer cheeses like ricotta, cream cheese, or goat cheese, are more susceptible to mold and bacteria and should be tossed at the first sign of spoiling or once the expiration date has passed, whichever comes first. As a general rule of thumb, softer cheeses last about one week in the refrigerator after opening.
It may seem like spreads and sauces last forever, but just because they’re in a glass jar tucked away in the cool refrigerator doesn’t mean they’re untouchable by bacteria. “Once you’ve opened the lid, that safety seal is broken, and you should be using that condiment in a timely fashion,” says Crandall. “In addition, as we make sandwiches for example, we dip our knife into the spread container and wipe it onto the sandwich and then dip it back into the container. By doing this you’re putting some of that bacteria back into the container.” Jarred condiments tend to have more exposure to bacteria and therefore could lead to foodborne illness if not trashed at the appropriate time. If you notice any water floating on top, discoloration, or weird smells—just toss it. Check out the 16 things you never knew had an expiration date.
Similar to jarred spreads like mayo and mustard, potato or egg salads are more susceptible to bacteria growth because they have more instances of exposure. Taking a few scoops at a time from the container introduces more bacteria and increases risk of contamination leading to foodborne illness. Salads like these are often pushed to the back of the fridge and forgotten about, giving time for that bacteria to grow and for that food to spoil. “Our food system is very safe, but sometimes when things fall out of temperature or if there is bacteria introduced, we have to be extra cautious with those things,” says Crandall.