STORAGE Of FLOURS:  The natural oils found in whole grain flours, including cornmeal, make them susceptible to rancidity. Store all whole grain flours in plastic bags in the refrigerator or freezer where it will keep for about a year. Keep it in bulk in an airtight container or place the entire flour bag into a ziplock bag and seal. To test if the flour is rancid, just smell it !  If it is, throw it out.

You can use whole grain flours directly from the refrigerator or freezer. When you use it, simply measure out what you need, and put the rest back in the freezer. You do not have to thaw before using. Store all white flours in an airtight container in a cool, dark place--not the freezer or refrigerator. They too, will keep for a year.