Wash the fresh berries thoroughly under cool running water. Pat them dry with paper towels or a clean kitchen towel.
Spread the dry blueberries in a single layer on a rimmed baking sheet lined with parchment paper. Place the baking sheet in the freezer for 1-2 hours until firm. This prevents them from sticking together.
Transfer frozen blueberries into a freezer bag or freezer-safe containers. Squeeze out as much air as possible from the bags to prevent freezer burn. Label the bags or containers with the freezing date. Place the packages in the freezer for up to 12 months. Best used within 6 months.
Notes
To thaw:Refrigerator - Place blueberries in a bowl or a container and put them in the refrigerator. This method takes several hours or overnight. This method is the best option to keep the berries firm and help retain their shape. Cold water - Place the berries in a sealed plastic bag and submerge them in a bowl of cold water. This method takes about 5-10 minutes and will help retain some firmness. Room temperature - When you need the berries thawed relatively quickly, room-temperature thawing works well but will leave the berries slightly soft. Spread the blueberries in a single layer on a plate or tray and let them sit at room temperature. This method takes about 30 minutes to an hour.