At roughly 25 by 27 metres across, the oval enclosure at Rathmore sits on a slight natural rise in gently undulating grassland, with open views to the north-west and south. The enclosing bank, about 1.4 metres wide, still carries remains of dry-stone masonry on both its inner and outer faces, along with slabs set on edge or upright, giving the structure an unusually well-preserved character. A gap on the southern side, around 2.3 metres wide, marks what may be the original entrance.

Ringforts, sometimes called raths, were the most common form of rural settlement in early medieval Ireland, typically serving as enclosed farmsteads for a family and their livestock. This one retains a circular house site visible at the centre of the interior, which slopes from north-east to south-west. Two low banks extend outward from the house site, one northward toward the perimeter bank and a second fragmenting off to the south, suggesting internal organisation of the space that would once have been a working domestic enclosure. Traces of cultivation ridges running roughly north-north-west to south-south-east are visible across the interior, a detail that hints at agricultural use continuing within or around the monument at some point after its original occupation. The broader field carries further archaeology: a low sub-circular platform around 40 metres to the west-south-west may represent another monument, or may be connected to a nearby quarry depression, while a second earthwork about 30 metres to the south-south-west is tentatively identified as a levelled ringfort. If that identification is correct, what survives at Rathmore may be one node in a small cluster of early medieval activity rather than an isolated enclosure.