1. Freeze: Spread the blueberries on a rimmed baking sheet in a single layer. Place in the freezer for 2 hours.
2. Store: Transfer the frozen berries to a freezer bag or airtight container. Keep in the freezer for up to 6 months.
3. Defrost: Empty the berries into a bowl (to catch the juices). Let sit until they reach room temperature, 1 hour. The berries will be soft. Use them in smoothies, pies, pancakes, or muffins.