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Q What are the differences between Pasteurized milk, Ultra Pasteurized milk and Ultra High Temperature milk? A The difference is the shelf life, meaning the time that the milk will stay fresh before spoiling and becoming inedible. All of these start as the same milk; the only difference is in the pasteurization process and the packaging, both of which impact shelf life. PASTEURIZED MILK Pasteurized milk is heated at a minimum of 161°F for at least 15 seconds. Milk pasteurized using this method needs to be kept refrigerated at all times. SHELF LIFE: from 10 to 21 days. ULTRA PASTEURIZED MILK Ultra Pasteurized milk is heated at 280°F for 2 seconds. This process kills more bacteria than regular pasteurization. Ultra Pasteurized milk requires continual refrigeration but lasts long, once it is opened. SHELF LIFE: from 30 to 90 days. UHT – ULTRA HIGH TEMPERATURE MILK UHT milk uses the same process as Ultra Pasteurized milk (heated at 280°F for 2 seconds)but the difference is that it is packaged in a sterile packaging under aseptic conditions. This helps prevent bacteria from being re-introduced into the milk after it is pasteurized. UHT milk requires no refrigeration until it is opened and it stays fresh longer than any other pasteurized milk. SHELF LIFE: more than 6 months, if unopened