Milk that has been frozen properly before its expiration date can be thawed and safely consumed. Frozen milk should be thawed in cold water or in the refrigerator.
Defrosted milk is likely to have an altered flavor as well as texture. It should be consumed within a few days of thawing and be kept refrigerated.
Milk, like other liquids, will expand when it is frozen. Therefore, it is recommended that there is extra room in the container in which it will be frozen to allow room for expansion. Milk that has been left out at temperatures above 40 degrees Fahrenheit for more than 4 hours should be discarded.