Clam chowder can be stored in the freezer. Freezing clam chowder keeps it fresh much longer than refrigeration, and it lasts from four to six months when frozen properly.
Clam chowder should be placed in an airtight container or freezer bag before being stored in the freezer. Before freezing it, it needs to cool down to room temperature. However, it should not be left out for longer than two hours. The best way to thaw frozen chowder is by placing the bag or container of chowder in a large bowl of hot water for several minutes. Once the chowder starts thawing, place it in a pot, and reheat it on the stove.