Beneath the grass of this working pasture, faint traces of cultivation ridges run along a north-south axis across the enclosed ground, suggesting that whoever once lived here farmed within their own defences, turning the protected space into productive land long after, or perhaps alongside, its role as a settlement enclosure.

A ringfort, or rath, is an early medieval farmstead enclosed by one or more circular earthen banks and ditches, a form of settlement that was common across Ireland roughly between the fifth and twelfth centuries. The Kilbronoge example is a modest but legible specimen. The circular enclosure measures 38 metres across in both directions, making it a fairly typical example of the type. Its defining bank, which runs from the south-west around to the north-north-east, still stands to about 0.8 metres in height, with an external fosse, the ditch dug to provide material for the bank, dropping to around 0.6 metres in depth. A lower earthwork on the opposite arc, running north-north-east to south-west, retains a height of 0.5 metres, with a shallower accompanying fosse of 0.3 metres. A possible entrance gap some 5 metres wide survives to the north-north-east, the opening through which animals and people would once have passed. The site sits on an east-north-east-facing slope, a typical choice for early farmers who valued morning light and some shelter from the prevailing Atlantic weather.