Where a ringfort once stood, the ground now gives itself away not through upstanding walls or dramatic earthworks but through the subtler language of crops: darker, lusher growth tracing the circular outline of a structure that farming has largely flattened over the centuries. These cropmarks, visible as the barley grows unevenly above buried ditches and banks, are among the quieter forms of archaeological evidence, easy to miss on foot but legible from above or from the field's edge at the right moment.

The site is a rath, the Irish term for a ringfort enclosed by earthen rather than stone banks. Ringforts of this type were the most common form of rural settlement in early medieval Ireland, typically dating from roughly the sixth to the tenth century, and used as enclosed farmsteads by families of varying social rank. At Garraun, enough of the original form survives to give a sense of the structure's scale: a roughly circular raised area some 38 metres across on its northwest to southeast axis, defined by an earthen bank that still stands around 0.7 metres high on its interior face and 1.4 metres on the exterior. Beyond the bank, a shallow external fosse, the term for a defensive or boundary ditch, once reinforced the enclosure. On the southeastern to northwestern arc, the bank and fosse remain more legible as physical features; on the opposite arc, they have been reduced to near nothing by tillage, surviving only as those telling lines in the crop above.