Refrigerate berries in a covered shallow container. Use raspberries within 1 to 3 days; blackberries within 3 to 5 days.
Rinse berries under cool running water just before using. Moisture during storage speeds spoilage.
To store longer:
- Freeze whole berries on a tray until firm.
- Package in freezer containers or re-sealable plastic bags.
- Label with date and use within 8 to 12 months for best quality.