Buttermilk pie should be kept in the fridge in an airtight container to prevent spoilage and is best for three to four days after baking.

Freeze any leftover buttermilk pie by tightly sealing it in an airtight zip-top bag or container. Pies stored in the freezer are best kept for two months. To defrost, place in the refrigerator overnight. Reheat leftover pie in the oven at 325 degrees Fahrenheit to warm.