Judy, I am the coordinator of the milk bank/breastfeeding center in Worcester, MA. The guidelines that we use are as follows: If freezer is maintained at zero degrees fahrenheit in a freezer with a refrigerator milk can be stored for 3-4 months easily. If milk is stored at zero degrees in a non frost free separate (no refrigerator) freezer it can be kept for one year. Darlene Breed RN, BSN, IBCLC