What survives at Lecarrow is a rath, a type of ringfort built from earth and stone that served as a farmstead or small defended settlement for an Irish family, probably sometime in the first millennium AD. The circular area enclosed measures around 18.5 metres in diameter, a modest footprint, and the bank that defines it, roughly 4.5 metres wide, still stands to an internal height of about 0.8 metres on its better-preserved sides.

The site sits on a gentle east-facing slope of a ridge running roughly north-northwest to south-southeast, which would have given its inhabitants a useful outlook across the surrounding ground. The bank has been significantly levelled along its northern and eastern arc, the kind of gradual erasure that centuries of agricultural activity tend to produce. No original entrance survives in recognisable form, which makes it impossible to say how people once moved in and out of the enclosure. More intriguing is a small subcircular structure that projects inward from the inner face of the bank at the west-southwest, interpreted as a possible hut site. Features like this are not uncommon in ringforts; they represent the domestic side of these places, the actual spaces where people sheltered, stored goods, or kept animals close at hand, though at Lecarrow the structure is too fragmentary to say much more than that it once existed and that someone built it deliberately within the protection of the enclosing bank.