Storing grains/grain products in your freezer is the best way. If you don't have enough room in your freezer, I recommend storing them in a solid, air tight container. (such as Tupperware or plastic bucket). Since it's not treated with any insecticide (and most all grains in the U.S. are), keeping pantry insects out of it will be your biggest problem.

Granary insects have been a problem with stored grain for thousands of years. The adults are small enough they can exist in your pantry, unnoticed by many. They lay eggs which are microscopic and hatch into larva that eventually grow into something large enough to be noticed (and quite unsavory). These larva are capable of burrowing through cardboard and soft plastic into grains or flours, or sometimes the eggs are laid undetected in hard storage container and then filled with a grain product. Today, in the U.S. most people have forgotten about this problem because most all conventional grain products are treated with an insecticide either at the farm it was grown on or shortly there after. This usually isn't listed on any ingredient list because it is so common in the industry and assumed, even sometimes on products listed as chemical or pesticide free (since it's added so early in the grain supply chain, before any processor even receives it). Our grain has not been treated with anything to control granary insects and thus needs a little more care in storing. Freezing the grain occasionally and storing in a sealed hard container can control these insects.

Ideally, (if you intend to store long term and can not store them continually in your freezer) package them in a sealed container first, and then freeze the product and container for a week below 0 F. When you remove it from the freezer and bring the product back to room temperature, condensation may occur initially on the exterior of the cold container. If you keep the container sealed, the exterior condensation should not be a problem. Wipe dry and/or allow the moisture to evaporate completely before placing in more permanent storage.

Monitoring the grain (or grain product)  monthly is also a good practice.

We don't grow, store or handle our products in a sterile environmnet. We try and work within the nature God gave us, which includes insects. While we will guarantee that our products don't have observable insects when we ship them, we can't guarantee they are sterile when they leave our farm. We also can't guarantee they aren't exposed to insects when being shipped to you. (Organic untreated grain products are VERY attractive to granary insects which are everywhere) A single Indian meal moth female can lay 400 microscopic eggs in a few days and in warm temperatures the complete life cycle can occur in less than a month. In a few months, one microscopic egg is capable of turning into millions of insects. Controlling them in long term storage is YOUR responsibility.

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Keeping the grains and flours dry is also very important to control mold growth.

Temperature is not as much of a problem as are frequent temperature swings. If the temperature swings a lot daily, the moisture in the grain will migrate to the container edges. When the grain warms, some of the moisture comes out of the grain into the warmer drier air within the container. When the container cools, the additional moisture then collects on the cool wall of the container and condenses. After a number of cycles, the grain next to the container edges then becomes wet enough it can start to mold.

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If you are planning to store our grains for years or decades, they should be dried a little further. Ideally grain should be below 10% moisture for very long term storage.