Properly stored, blackberries will maintain best quality for about 10 to 12 months, but will remain safe beyond that time. The freezer time of one year is for best quality - blackberries that have been kept constantly frozen at 0°F will keep safe indefinitely. Frozen fuit retains nearly all the nutritional value of their fresh cousins.

How to Freeze

1. Pour your blackberries into a colander, and rinse in water
2. Remove any stems, leaves or damaged portions
3. Spread the blackberries out on a cookie sheet in a single layer and place in your freezer.
4. Once the berries are frozen, transfer them freezer-safe container.