How Long Does Milk Last?

How long does refrigerated milk last?

Refrigerated milk lasts 5-7 days past the printed date when properly stored at 40 degrees F or below. The printed 'best by' date is conservative; properly refrigerated milk typically remains safe and good-tasting for almost a week past it. Once opened, use within 7 days regardless of the printed date. Different milk fats have different shelf lives: whole milk lasts 5-7 days past date, 2 percent milk lasts 7-10 days, 1 percent and skim milk last 7-10 days, and lactose-free milk lasts 7-10 days. Half-and-half and heavy cream last 7-10 days past date due to higher fat content (which preserves better). Store milk in the main fridge body, not the door, which fluctuates in temperature each time the fridge opens. The temperature difference between door storage and main body can shorten milk life by 1-3 days.

How long does ultra-pasteurized milk last?

Ultra-pasteurized milk (UHT milk) lasts significantly longer than standard pasteurized milk. Refrigerated UHT milk lasts 7-10 days past the printed date once opened. Shelf-stable UHT milk in aseptic packaging (the boxed kind in the dry goods aisle, not refrigerated) lasts 6-9 months unopened at room temperature; once opened, refrigerate and use within 7 days. The ultra-high temperature processing destroys nearly all bacteria and enzymes, extending shelf life dramatically at the cost of a slightly cooked flavor that some people notice. Organic milk is often ultra-pasteurized to extend retail shelf life, which is why organic milk often has longer printed dates than conventional milk.

How can you tell when milk has gone bad?

Bad milk shows clear signs in this order. Sour or off smell is the most reliable indicator; spoiled milk has a distinctly sour, unpleasant odor that's noticeably different from fresh milk. Curdling or chunks form as bacteria break down the proteins; pour a small amount into a clear glass to check for chunks or visible thickening. Yellow or off-white discoloration in formerly white milk indicates spoilage. Slimy or thickened texture beyond the normal consistency means spoilage. Bitter or sour taste (after smell and appearance checks come back acceptable) confirms spoilage. Spoiled milk poured into hot coffee will often immediately curdle, even when it still looks normal in the container; this is a useful additional test. Trust your nose; the smell test catches most spoilage before any safety risk emerges.

Can you freeze milk?

Yes, milk freezes for 3 months when properly prepared. Pour 1-2 cups out of a full gallon container to allow room for expansion during freezing (otherwise the container can crack). Freeze in the original container or transfer to freezer-safe containers. Frozen milk separates and changes texture; the fat may rise to the top and the proteins can clump slightly. Shake vigorously after thawing to restore consistency; the texture isn't perfect but is acceptable for cooking, baking, and most drinking purposes. Whole milk freezes worst because of the higher fat content; skim milk freezes best with the least texture change. Thaw frozen milk in the fridge over 24-48 hours; never thaw at room temperature due to bacterial growth risk. Use thawed milk within 5-7 days; the shelf life resets after thawing.