Hello, I'm an expert in food safety and preservation. When it comes to the shelf life of milk, there are several factors to consider, including the type of milk, whether it's pasteurized, and how it's stored.

Generally, for pasteurized milk, once opened, it can last in the refrigerator for about 5 to 7 days. However, it's important to check the expiration date on the carton, as this can vary. After opening, it's also crucial to reseal the milk container properly to prevent contamination.

For ultra-pasteurized milk, which is treated at a higher temperature to extend its shelf life, it can last a bit longer, typically up to 2 to 3 weeks once opened, but again, check the expiration date.

Raw milk, if you can obtain it legally in your area, has a much shorter shelf life and should be consumed quickly, ideally within a day or two.

Regardless of the type, always check for signs of spoilage such as sour smell, curdling, or change in color before consuming.

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Milk Expiration Date(Unopened)RefrigeratorReduced-Fat Milk lasts for7 DaysWhole Milk lasts for5-7 Days(Opened)RefrigeratorPast Printed Date5 more rowsread more >>