No doubt about it—buttermilk is a staple ingredient in Southern cooking. From Buttermilk Biscuits to Buttermilk Coleslaw, there’s nothing that isn’t made just a bit better by this wholesome ingredient. But if this beloved dairy product is already fermented, you may wonder: Does buttermilk go bad?
Alabama-based dietitian Chelsea Edwards tells Southern Living that yes, buttermilk absolutely goes bad.
“Historically, buttermilk was a byproduct of churning cream into butter. It is the low-fat liquid leftover from the butter-making process,” Edwards says, adding that today it is typically fermented non-fat or low-fat milk that has lactic acid added. “Buttermilk can go bad, just like any other dairy product.”
Does Buttermilk Go Bad?
According to the U.S. Food and Drug Administration (FDA), buttermilk can last up to two weeks in the refrigerator.
“Milk can be refrigerated (for) seven days; buttermilk, about two weeks,” the USDA website states, adding that their organization only regulates meat, poultry, and eggs, and the FDA regulates other food. “Milk or buttermilk may be frozen for about three months.”
Edwards adds that buttermilk must be refrigerated to prevent bacteria growth.
How To Tell If Buttermilk Is Bad
The best way to tell if buttermilk has gone bad is by using your senses of sight and scent.
“Buttermilk has gone bad if there is mold, a change in color, a stronger sour scent than usual, or thickening or chunks,” Edwards says. “Normally it is smooth once you shake it.”
Edwards notes that buttermilk can separate, so that is not necessarily a sign of spoilage and it should be shaken well before use.
Can You Freeze Buttermilk?
You can freeze buttermilk before it expires or spoils in a food-safe container. To thaw, place the frozen buttermilk in the refrigerator and allow it to thaw over a day or so.