Can You Freeze Buttermilk?
Yes, you can freeze it.
3 months
Separates on thawing; shake or whisk before using in baking.
Buttermilk is more freezer-forgiving than most fresh dairy on this site precisely because it's already acidic and cultured, properties that make it naturally more resistant to the kind of bacteria a neutral liquid like plain milk is vulnerable to. Ice-cube-tray portions are worth the extra step for buttermilk specifically, since most recipes call for less than a full cup and thawing an entire container just to measure a quarter cup wastes the rest. After thawing, a quick whisk brings the separated liquid and solids back together well enough for baking, where its acidity does the leavening work regardless of whether the texture looks perfectly smooth.
Cultured buttermilk, the tangy, thickened product sold in most grocery stores today, is a different thing from old-fashioned buttermilk (the thin liquid left behind after churning butter), though only the cultured version is what this site's guidance actually covers, since traditional buttermilk is now rare outside home dairy operations. A full carton can be frozen as-is for baking purposes without portioning first, if the plan is to use the whole thing in one bread or pancake batch once thawed, though the ice-cube approach above stays more flexible for smaller-batch baking. Buttermilk frozen and thawed loses a little of its tang along with its smooth texture, a minor trade most bakers don't notice once it's baked into a biscuit or a loaf of soda bread.
Storage times and safe temperatures are general guidance from USDA FoodKeeper, USDA FSIS, and FDA sources — they are not a guarantee of safety. When in doubt, throw it out. This is not a substitute for professional food-safety advice.
Source: USDA FoodKeeper data, checked 2026-07-12.