Is It OK to Drink Expired Milk?
Milk is often safe for several days past the sell-by or best-by date if properly refrigerated. These dates indicate peak quality, not safety cutoffs. However, spoiled milk can cause digestive upset. Always check for sour smell, curdled texture, or off taste before consuming.
Key Takeaways
- Milk date labels are quality indicators, not strict safety deadlines—the same principle applies to eating food after expiration dates in general.
- Ultra-pasteurized milk lasts much longer (up to 2 months unopened) than regular pasteurized milk.
- Once opened, all milk types should be consumed within 7-10 days regardless of the printed date.
Explanation
Milk date labels are quality indicators, not strict safety deadlines—the same principle applies to eating food after expiration dates in general. Properly stored milk (at 40°F or below) typically remains good for 5-7 days past the printed date. The dates are conservative to ensure stores sell milk at peak freshness.
To determine if milk is still good, use your senses. Spoiled milk has a distinctly sour or unpleasant odor, even when cold. It may also appear lumpy, curdled, or have an unusual color. Fresh milk should smell neutral or slightly sweet.
Drinking slightly soured milk is unlikely to cause serious illness in healthy adults - it may taste unpleasant and could cause minor stomach upset. However, visibly spoiled milk with chunks or mold should always be discarded.
Refrigerator temperature has the single biggest impact on how long milk stays fresh past its date, just as it determines how long eggs last in the fridge. Milk stored at 37°F lasts noticeably longer than milk stored at 40°F. The back of the refrigerator maintains the most consistent cold temperature, while the door shelf, where many people store milk, is the warmest spot and experiences the most temperature fluctuation each time the door opens. Moving milk to a lower shelf in the back can extend its usable life by 2-3 days.
Different types of milk have distinctly different shelf lives after their printed dates. Whole milk tends to spoil slightly faster than skim milk because the higher fat content provides more medium for bacterial growth. Organic milk is often ultra-pasteurized (heated to 280°F instead of the standard 161°F), which is why it frequently lasts 40-60 days unopened compared to 15-20 days for conventional pasteurized milk. Plant-based milks like almond and oat vary widely but generally last 7-10 days after opening regardless of the printed date.
Things to Know
- Ultra-pasteurized milk lasts much longer (up to 2 months unopened) than regular pasteurized milk.
- Once opened, all milk types should be consumed within 7-10 days regardless of the printed date.
- Lactose-free milk often lasts longer than regular milk due to additional processing.
- Milk that has been left out at room temperature for more than 2 hours should be discarded, even if it looks and smells fine, because bacteria double every 20 minutes above 40°F.
- Ultra-pasteurized (UHT) milk sold in shelf-stable cartons can last 6-9 months unopened without refrigeration. Once opened, it follows the same 7-10 day refrigerated window as conventional milk. Standard pasteurized milk heated to 161°F for 15 seconds lasts 15-20 days sealed, while ultra-pasteurized milk heated to 280°F for 2 seconds lasts 60-90 days sealed and refrigerated.