These kilns were a practical necessity in Ireland's damp climate, used to dry harvested grain before it could be ground into flour or meal. A typical example consisted of a small stone-built flue or bowl-shaped chamber, sometimes set into a slope, where a slow fire below would draw heat upward through a perforated floor on which the grain was spread. Without this process, wet grain would spoil or grind poorly, making the kiln as essential to a farming community as the mill itself.

Corn-drying kilns are found throughout Ireland, but they cluster particularly in the west and north, where Atlantic weather made field-drying unreliable for much of the year. The Rinneen example sits within a landscape that would have supported small-scale tillage farming, likely worked by tenant families during the post-medieval period, though such structures often have roots stretching back to early medieval practice. Their stone construction means many have partially survived even where the communities that built them are long gone, and they are frequently recorded as low circular or keyhole-shaped platforms, sometimes confused at first glance with the remains of hut sites or enclosures.