Yes, freezing homemade soup is a great way to store leftovers for a later date. When ready to freeze, be sure the soup has cooled completely to room temperature. Place in a freezer-safe container with a tight fitting lid. Frozen, soup will keep for up to three months. When ready to thaw, thaw in the refrigerator overnight. You can also place in a soup pot, with additional broth and slowly thaw, then bring to a simmer.