Finally - Locally Made Milk That Will Last! Ultra High Temperature Milk – it’s milk that has been heated to 280 to 302 degrees for a couple seconds and then placed into a sterile container - which gives it longer shelf life. In the past, consumers would frequently complain that the Western Dairies milk in the stores lasts less than a week before it starts turning sour. But that’s because it’s unpasteurized and unprocessed, unlike the imported LALA milk. But the dairy company is stepping up their