What survives of this cashel, a type of early medieval ringfort built from stone rather than earthen banks, measures around 22.5 metres in diameter and runs from the south-west through north to the south-south-east. Beyond that arc, no surface trace remains. The structure itself would be easy to overlook entirely, and yet the local memory attached to it gives the place a weight that the surviving stonework alone does not.

According to local tradition, the enclosure was used as a children's burial ground. This connects it to a wider and largely unwritten chapter of Irish social history. Before Catholic canon law was relaxed in 2006, unbaptised children could not be buried in consecrated ground, and families often interred infants in liminal places, old raths, cashels, and other sites already considered apart from the ordinary landscape. These burial places, sometimes called cillíní, exist across Ireland in their hundreds, frequently occupying the edges of earlier archaeological monuments whose sanctity or separateness made them feel appropriate. The Colesgrove site appears in McCaffrey's 1952 survey, which places it among a catalogue of similar monuments in the region, though the oral tradition associating it with infant burial is recorded as coming from local knowledge rather than documentary evidence.

The combination of a poorly preserved early medieval enclosure and a tradition of cillín use makes this a site that speaks more through its absence than its fabric. The wall that remains is fragmentary, the rest erased by time and agriculture, but the field in Colesgrove quietly holds two very different layers of the past at once.