The rise is modest, just 0.4 metres above the surrounding field level across a span of roughly 30 metres, but what it represents is considerably older than anything else in the neighbourhood. This is a rath, a type of ringfort, the most common form of early medieval settlement in Ireland. Typically earthen, roughly circular, and enclosed by one or more banks and ditches, raths served as farmsteads for families of some local standing, probably between the sixth and tenth centuries. The one at Ballyhooly is unassuming enough on the ground, but it has left a clear trace in the documentary and aerial record.

The Ordnance Survey mapped it as early as 1842, rendering it in the standard hachured style used to show circular enclosures, with a diameter of around 22 metres for the core feature. Later editions of the six-inch map, from 1905 and 1935, continued to record it as a raised circular area, meaning the earthwork was holding its shape across nearly a century of agricultural use. The most revealing evidence, however, came from the air. An aerial photograph captured the site as a cropmark, showing not just the bank but an external fosse, the ditch that would have run around the outside of the enclosing bank, giving the whole structure both a defensive edge and a symbolic boundary. Cropmarks appear when buried or levelled features affect soil moisture, causing overlying crops to grow differently, and they can reveal detail that is entirely invisible at ground level. Adding another layer of interest, a second ringfort sits just 40 metres to the south-west, suggesting this ridge above Ballyhooly was a place of some sustained settlement in the early medieval period rather than a single isolated farmstead.