A fulacht fia is a type of ancient outdoor cooking place, typically consisting of a horseshoe-shaped mound of fire-cracked stone and charcoal built up around a trough, where water was heated by dropping in stones made red-hot in a nearby fire. At Rochfordstown, even that modest physical trace has largely vanished; the ground above it shows no visible surface trace whatsoever, leaving nothing to distinguish this spot from any other ploughed field in the parish.

The site's earlier condition was recorded by Walsh in 1985, who noted a low, irregularly shaped mound no more than 0.2 metres high, partially overgrown and sitting in marsh. The marshy ground is significant; fulachtaí fia are almost invariably found close to water or in wet, low-lying areas, since a reliable water source was essential to the whole process. What makes Rochfordstown quietly notable is that this is not an isolated find. A second fulacht fia lies in the marsh at the southern end of the same field, suggesting that this particular patch of boggy ground was returned to, or used continuously, as a cooking or processing location across some span of prehistoric time. Whether the two sites were used simultaneously or represent separate episodes of activity separated by generations is impossible to say from surface evidence alone.