One of the questions we are asked a lot before Thanksgiving is “Do I need to refrigerate my pumpkin pie or not?” Probably the main reason for the confusion is seeing all the pumpkin pies at the grocery store just sitting on the shelves—stored at room temperature. The main difference between the grocery store bakery pies and the ones that you make at home is the ingredients. Those bakery pies are made with shelf-stable ingredients which can include preservatives and anti-microbials that won’t allow the growth of bacteria. If you read the label on the pie you may see a notation of RT; indicating the pie can be stored at room temperature. Leftover pieces of these pies should be stored in the refrigerator. Remember to use the pie within 2-3 days. If you need to store it for a longer time, consider freezing the pie.
When you make your own pie from scratch, you should refrigerate it as soon as it has had a chance to cool. Homemade pies have ingredients like milk and eggs which provide a great medium for bacterial growth. If you prefer a warm piece of pie, you can always warm the pie just prior to serving. Enjoy!