![]() Manufacturers make aseptic, or ultra high temperature (UHT), milk by heating the milk with sterile equipment and filling it under aseptic conditions into specially designed containers that can extend the shelf life to more than 6 months. This longer shelf life is due to a higher heating temperature during the processing. For example, ultra-pasteurized milk can last about 30–90 days. There are different methods of pasteurization that can further extend the shelf life of milk. Some evidence suggests that pasteurized milk should remain fresh for 2–5 days after its sell-by date and 10–21 days in total. Although this makes the milk safer to consume, it does not mean that it is safe to leave milk out of the refrigerator for an extended time, particularly after opening it. Most milk that people purchase in the United States has undergone pasteurization, which involves heating the milk to kill harmful pathogens. Different types of milk can remain fresh for varying lengths of time. There is no universal duration for how long milk is safe to consume after the expiration date. Share on Pinterest Михаил Руденко/Getty Images
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