【How-to】How long is pb2 good for after mixing

Peanut butter generally has a long shelf life. In the pantry, commercial peanut butters may last 6–24 months unopened, or 2–3 months once opened. … Powdered peanut butter is best stored in a cool, dark, dry place, such as the pantry, and the best-by date states it can be stored up to 12 months.