Lay all the berries out in one layer on a baking sheet and put them in the freezer for around four to five hours.
When they’ve frozen (and are solid), transfer the sheet to a freezer-safe dish that has a lid. This allows the berries to stay in the freezer for a longer period.
After transfering to a freezer-safe dish or freezer bags, put it to your freezer again.
Notes
Avoid rinsing your blueberries before freezing them as it takes away their natural coating, called the bloom. This coating protects them from bacterial growth.
If you want your frozen blueberries to last longer and retain its fresh taste, make sure they’re freshly picked, deep blue, and juicy.
Before freezing, making sure you remove any stems and rotten blueberries.