Our manufacturing codes on our packages indicate the appropriate time for the product to be consumed to ensure its quality. How Do You Find Expiration Date On Pop Tarts? How can I find a date code for a car in Marlboro? This number is usually in the range of six or seven digits. They can be kept frozen for up to three months after being frozen. How long does it take to bake a perfect Pop Tart? Microwaves typically emit 30-40 watts of heat, though the intensity varies greatly depending on the model. Pop Tarts contain a variety of highly processed ingredients, including soybean oil and refined flour. The key is to understand that the expiration date is written in MMDDY format. Pop tarts should only be left out of the oven for an extended period of time, ideally 12 to 18 months, before storing them properly. The expiration date will be listed there, in the format “MMDDYY.” Just look on the back of the Pop Tart package, near the nutrition facts. If you’re one of those people, you might be wondering where to find it. Most people don’t realize that Pop Tarts have an expiration date.