Unless you know you’ll use a whole container shortly after thawing, it’s best to freeze milk in smaller portions. One-cup or pint-size portions are convenient. Freeze milk in freezer-safe containers or in well-sealed freezer bags – but be sure to include some extra space, as milk expands when it freezes. Use the frozen milk within 1 month. Defrost in the refrigerator, and shake it well before using it. Milk sometimes becomes grainy after it’s been frozen and defrosted – if the texture is too unpleasant to use for drinking or on cereal, use the milk for cooking or baking.