This is a rath, the most common type of early medieval enclosure in Ireland, typically formed by a circular or oval bank and outer ditch and used as a farmstead or small defended settlement. Thousands survive across the country, yet each one carries its own slow record of use, neglect, and gradual encroachment by the landscape around it.

At Kilross the enclosing bank varies in width from about five to six and a half metres, and its height, measured from the interior, reaches less than a metre at its tallest. Outside the bank runs a fosse, the accompanying ditch, which is best preserved on the west-south-western side where it widens to nearly five metres and deepens to around seventy centimetres. A possible entrance opening, about four and a half metres wide, sits at the south-west. The interior slopes gently down toward the north-north-west and is dotted with rushes where moisture collects. Agricultural drainage work has left its mark throughout: land drains cut across the southern sector, truncating both the fosse and the base of the bank, and a wider drain on the western side actually breaches the bank at the north-west and continues beyond the monument's edge. A narrower drain on the eastern side may once have connected to the fosse, though overgrowth now makes the relationship difficult to read. Cattle have opened further gaps around the circuit, and dense furze obscures stretches of the bank on the south-west through to the north-east. The monument survives, but only just, shaped as much now by drainage requirements and grazing animals as by whoever first raised the bank.