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Kernels Can Keep For Two Years
According to research at the University of Nebraska-Lincoln, popcorn kernels can be kept for up to two years. Popcorn kernels stay freshest when stored in a cool, dry place.
The Storing Location Matters
According to the National Popcorn Board, popcorn kernels need to contain around 14 percent moisture in order to pop. Storing popcorn kernels in a refrigerator or leaving them uncovered in hot weather can quickly decrease moisture and by default the quality of the kernels.
According to the Popcorn Board, the best way to store kernels is in an airtight container, either plastic or glass. That container should be kept "in a cool place like a cupboard."