The general rule of thumb is that opened milk remains safe to consume for up to 7 days after opening if refrigerated properly.

If stored properly at a temperature of 40°F (4°C) or below, milk can typically last 5 to 7 days after opening.

Because fresh air is introduced and anything floating in it, you can expect opened milk to last three to four days under ideal conditions in the refrigerator.

Most research suggests that as long as it’s been stored properly, unopened milk generally stays good for 5–7 days past its listed date, while opened milk lasts at least 2–3 days past this date.

Milk is a staple of many households, but sometimes we don’t use it all before the expiration date. Once opened, milk can be susceptible to spoilage, which can be a waste of money and food.