Q&A: How Will I Know If My Milk Is Spoiled?
How can you tell when frozen milk has gone bad?
Just like any sort of milk, you can tell it's bad when it stinks. (And if you still aren't sure, you can always taste a few drops.) As a general rule, frozen milk will stay good in a chest-style deep freezer for six months to a year; in a freezer attached to a refrigerator (with a separate door) for three to six months or in a freezer compartment inside a refrigerator for up to two weeks.