To make sure your California Walnuts stay fresh as long as possible, keep them in an airtight container in a cold place and avoid exposing them to warm temperatures for long periods of time. Pop them in the fridge if you plan to use them within a month, or store them away in the freezer if you want to keep them for longer. Remember to keep them away from foods with strong odours, as walnuts can absorb the flavours of other foods. Walnuts can be stored in their original, sealed packaging – but once you open the bag, you should transfer them into an airtight container to maintain freshness.