Yes, it’s ok to freeze milk and best to do so on the day of purchase! Due to the fact that milk expands, never freeze it in a glass bottle and make sure you leave room in the container so it won’t burst.
After you have frozen your milk, it can be thawed in the refrigerator or in cold water and is safe for consumption. To restore the smoothness, you can give it a good shake.
Remember you don’t have to throw milk away – you can always plan something different.  Freeze it, cook with it or try adding it to easy to make pancakes, rice pudding, cheese sauce for macaroni or cauliflower cheese etc. Soups and porridge are more nutritious made with milk.