Whole wheat flour has a longer shelf life than some other flours. It can last up to 6 months when stored in an airtight container at room temperature. If stored in the refrigerator, it can last up to a year. You should store whole wheat flour away from light and moisture as they can cause mold growth. When storing whole wheat flour, make sure to label the container with the date it was bought so you know how long it has been around. And always check the expiration date on the package before using any type of flour.