The site consists of a nearly circular earthen enclosure measuring 16.7 metres across its interior. The defensive earthwork includes a bank that rises up to 63 centimetres in height, accompanied by a now silted fosse, or defensive ditch, that once stretched 1.6 metres wide around the perimeter.

The ringfort's interior remains level, though it bears traces of more recent history; the space was cultivated as a garden before falling into disuse. A gap measuring 1.45 metres wide on the southwest side likely marks the original entrance, where inhabitants and visitors would have passed through the earthen defences. Today, the monument sits peacefully in good pasture land, its ancient form still clearly visible despite centuries of weathering.

Ringforts, known locally as raths, served as fortified homesteads during Ireland's early medieval period. This example at Grousehall represents one of thousands scattered across the Irish landscape, each telling a story of farming communities who sought both protection and prominence by building on elevated ground. The site was documented in the Archaeological Survey of County Donegal, a comprehensive catalogue of the county's field antiquities spanning from the Mesolithic period through to the 17th century.