Milk can be frozen in a freezer-safe container to preserve its freshness for use at a later time, according to the Dairy Council of California. Store the milk in a container that is large enough to allow room for the liquid to expand once it begins to freeze and solidify.
Freezing prevents milk that is near its sell-by date from spoilage. Place the container of frozen milk in a sink or larger container of cold water to thaw, or allow it to thaw in the refrigerator. Freezing may affect the milk's consistency and flavor, so it is best used for cooking and baking rather than drinking.