Milk is a staple in most households, but because it is highly perishable, storing it correctly is essential to maximize its shelf life and prevent foodborne illness. If you find yourself constantly checking the date printed on the carton, here is everything you need to know about how long your milk will actually last.
The “Sell-By” Date vs. Actual Expiration
The date stamped on your milk jug can be confusing, but it is important to understand what it actually means.
- The printed date is usually a “sell-by” date, which tells the grocery store how long to display the product for sale. It is not an exact expiration date.
- Under optimal conditions, unopened milk generally lasts 1 week in the refrigerator.
- Once opened, milk is typically safe to drink for 7 to 10 days past the printed sell-by date, provided it has been kept continuously cold.
The Best Place to Store Milk
Where you place the milk inside your refrigerator makes a massive difference in how long it stays fresh.
- Avoid the door: Never store milk in the refrigerator door. The door is the warmest part of the fridge and experiences the most drastic temperature fluctuations every time it is opened.
- Use the back shelves: Store your milk in the back of the main interior shelves, preferably near the bottom. This is the coldest and most temperature-stable zone in your refrigerator, ideally maintaining a temperature below 40 °F.
Signs Your Milk Has Gone Bad
Regardless of the printed date, always rely on your senses to determine whether milk is still safe to consume. Discard the milk immediately if you notice:
- A sour odor: Spoilage bacteria produce lactic acid, which gives bad milk its distinct, pungent smell.
- Changes in texture: If the milk looks chunky, lumpy, or curdled, the proteins have broken down, and it is no longer safe to drink.
- A yellowish tint: Fresh milk should be opaque and white. If it takes on a dull or slightly yellow hue, it has spoiled.
Can You Freeze Milk?
If you cannot finish your milk before it spoils, you can freeze it to extend its life.
- Milk can be safely frozen for up to 3 to 6 months.
- Because liquids expand when frozen, be sure to leave an inch or two of space at the top of the container so the jug does not burst in the freezer.
- When you are ready to use it, thaw the milk slowly in the refrigerator. You may notice some separation, but shaking it vigorously will help restore its normal texture.
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