The trees grow both inside the ring and along its edge, their roots threading through what was once a deliberate boundary. On the eastern side, a low bank of earth and stone still traces that boundary, though intermittently; on the southern side, a scarp in the ground takes over, and a scatter of larger stones along it may be the remnant of a faced retaining wall. To the west, a field fence runs north to south directly on top of the old perimeter, so the modern agricultural boundary and the early medieval one have essentially merged into a single line.

Ringforts, known in Irish as raths or lios, were enclosed farmsteads typically built during the early medieval period, roughly between the fifth and twelfth centuries. They were domestic spaces, usually defined by a circular earthen bank and sometimes a ditch, enclosing a homestead and its associated outbuildings. The Curtlestown example shows the usual circular plan, though its defining features are now fragmented and partly absorbed into later land divisions. What gives the site an additional layer of interest is a documentary trace: it appears on an estate map dated 1816, part of a set produced for the Powerscourt Estate and now held in the Irish Architectural Archive. The fact that estate cartographers took the trouble to record it suggests it was still a recognisable feature in the landscape at that time, even if they did not necessarily understand what they were marking. A forestry track skirting the northern edge of the site follows the line of an earlier roadway, which hints that the area around the ringfort remained in use long after the enclosure itself was abandoned.