Corn kilns, sometimes called grain-drying kilns, were a practical necessity in the damp Irish climate, used to dry harvested grain before it could be safely milled or stored. They typically consist of a small stone-built flue or bowl, sometimes set into a hillside, with a fire lit at the lower end and the grain spread on a perforated floor above to catch the rising heat. Hundreds of such structures were built across the country, most of them modest and functional, and many now survive only as low stone footings partially reclaimed by grass and bracken.

The presence of a corn kiln at Croaghill points to a period when this part of Galway supported a working rural community dependent on cereal crops, most likely oats or barley, as staples of both diet and local trade. Such kilns were in common use from the medieval period onward and remained a feature of the Irish countryside well into the nineteenth century, only falling out of use as commercial milling and improved storage methods made them redundant. The particular history of this example, its age, who built it, and when it fell out of use, remains to be fully documented.