Place the blueberries in a colander and gently rinse under cold water.

Immediately pat the blueberries dry with a paper towel.

Line a baking sheet with parchment paper. 

Arrange the blueberries in a single layer on the prepared sheet. 

Freeze until solid, about 4 hours. 

Transfer the frozen blueberries to a ziplock bag labeled with the date. 

Return to the freezer.