The rath at Garranacool sits on a south-facing slope in upland Tipperary, commanding views in every direction, and yet its interior remains effectively closed off, buried under dense vegetation that defeated attempts to examine it properly. The enclosing earthen and stone bank is largely intact, and the outer fosse, a defensive ditch ringing the outside of the bank, still holds a running stream along its north-eastern to south-eastern arc. The west half of the interior was dry at inspection; the east half was waterlogged. The fort thus contains two distinct micro-environments, divided invisibly by its own ancient geometry.

Ringforts, sometimes called raths when they are earthen rather than stone-built, are among the most common early medieval monument types in Ireland, typically associated with farming settlements of roughly the fifth to twelfth centuries. This example is a reasonable size: measurements recorded in a 1956 Office of Public Works file give a diameter of around 55 metres north to south and 49 metres east to west, with a bank roughly 0.9 metres high and 2.6 metres wide at its base, and a fosse some 1.6 metres deep. What is notable in those older observations is that there was no evidence of any levelling of the bank or ditch; the whole enclosure simply follows the natural slope of the land as it falls from north to south. No clear entrance feature has been identified. The gaps visible in the bank today are most likely cattle gaps opened over the centuries of agricultural use, which is also probably what accounts for the fort's relative good preservation, since farmers often maintained such enclosures for practical reasons even without knowing or caring about their age. A second ringfort lies about 150 metres to the north-west, making this part of Garranacool an area of some early medieval activity, though the two sites are treated as distinct monuments rather than a paired complex.