The key to storing berries is to freeze them when they’re at their peak ripeness to ensure that they maintain the most flavor and nutrition content. When working with blackberries, strawberries, raspberries, and cherries, start by washing the berries gently in cold water. Next, drain the berries, letting them sit in a colander for up to 10 minutes to remove as much water as possible. Once dry, seal the berries in an airtight container and freeze them at zero degrees Fahrenheit.
When working with blueberries, however, skip the washing step. Researchers from Clemson University warn that washing blueberries before freezing them results in an undesirable, tougher-skinned berry. Instead, the researchers suggest washing the berries right before using them in a recipe.