Ringforts, known in Irish as raths or lios, were the most common form of rural settlement in early medieval Ireland, typically consisting of a circular area enclosed by one or more banks and ditches. They served as farmsteads for individual families, probably between the fifth and twelfth centuries, and Clare has an unusually dense concentration of them, scattered across its limestone plains and low hills.

Beyond its classification and location, the particulars of this site remain obscure. No detailed information is currently available to establish its dimensions, condition, the number of enclosing banks it possesses, or whether any internal features such as a souterrain, an underground stone-lined passage sometimes associated with ringforts, have been recorded. Glennagross itself is a small rural townland, and like many such places in Clare, it likely sheltered farming communities continuously from the early medieval period onward, leaving traces in the ground that have yet to be fully documented or described in accessible form.