In Season: Fresh cranberries are available from October through December. Some markets also carry frozen cranberries year-round. What to Look For: Look for bright-colored firm cranberries in the produce section. Avoid bags that have brown or shriveled berries at the bottom. How to Store: Store in the original packaging for up to two weeks in the refrigerator, or up to one year in the freezer. To prep, rinse and discard any discolored or soft berries; if frozen, there's no need to thaw before use.