Rinse and drain the berries. Remove any stems or leaves.
Dry blueberries. I use one towel on top of a cookie sheet, then I add the blueberries. Use a second towel to gently rub over the top of the blueberries.
Transfer blueberries to another cookie sheet. You can line the cookie sheet with parchment paper, a silicone mat, or leave it plain.
Place the cookie sheet in the freezer until frozen. Remove from the freezer and remove berries from the baking sheet. Place in a freezer-safe bag or container. Return to freezer.
Video
Notes
Make certain blueberries are dry before freezing.
Store berries in a deep freezer or one without an auto defrost.
Label and date the storage bags. It's easy to lose track once your freezer is full.
If the bag of blueberries begins to stick together, tap the bag on a firm surface. This will break the berries apart.
Don't thaw before using blueberries in baked goods.