There is no need to refrigerate peanut brittle. In order for it to stay crisp you'll want to keep moisture away from it. It is best stored at room temperature.

Does brittle need to be refrigerated?

To store: Store peanut brittle (once it's completely cooled) in an airtight container at room temperature. Do not refrigerate as the moisture from the fridge will cause the brittle to soften. Store for 6-8 weeks. To freeze: Peanut brittle can be frozen and stored up to 3 months.

What is the best way to store peanut brittle?

How do you store Peanut Brittle? Wrap tightly and store in an airtight container at room temperature. Proper storage should keep brittle fresh for up to two months—if you can resist eating it all at once!