These kilns were once as common as farmhouses across rural Ireland, stone-built furnaces used to burn limestone at high temperatures, producing quicklime that farmers spread on acidic land to improve the soil. For a few centuries they were essential infrastructure; now most are either collapsed, absorbed into field boundaries, or simply forgotten.

Lime kilns of this type were in widespread use across Ireland from roughly the seventeenth century through to the late nineteenth, when cheaper imported lime and changing agricultural practice made local burning uneconomical. The process was straightforward but labour-intensive: layers of limestone and fuel, usually coal or turf, were loaded into the kiln's bowl from the top, fired for several days, and the resulting quicklime drawn out from an opening at the base. The kiln at Kilroe represents this tradition at a local scale, tied to the farming and land management of whoever worked the surrounding fields. Galway's geology, with its limestone karst bedrock particularly prominent across the county, meant that raw material was rarely far away, and small community or farm kilns were a practical response to the cost of transporting processed lime over difficult terrain.