Most medieval churchyards in Ireland are roughly rectangular or oval, shaped by the curve of an earlier earthwork or the practicalities of a field boundary. This one, defined by earthen banks and occasional stretches of masonry wall, encloses the old parish church of Rosslare on a low rise in the flat, quiet farmland of south Wexford, a short distance west of the road between Tagoat and Rosslare Strand. The nave is largely gone, reduced to a partial western gable standing about two metres high. By around 1840, when the scholar and topographer John O'Donovan passed through and recorded what he saw, that gable still had a double belfry at its apex. It does not now.

The chancel fares considerably better. Its clay-bonded walls, meaning the stones are set in clay rather than lime mortar, survive almost to their original roofline. A pointed chancel arch, its voussoirs, the wedge-shaped stones that form the curve of the arch, left undressed, separates what was nave from chancel. On the east wall, a two-light window with granite surrounds and round-headed lights retains its glazing grooves, though the central mullion has gone. Built into the north wall of the chancel is a plain tomb niche, the kind of shallow rectangular recess designed to hold an effigy or memorial. At the east end of the south wall, a small aumbry, a wall cupboard used in Catholic practice for storing vessels or the reserved sacrament, is partly destroyed. Clergy of St. Mary's, Rosslare are documented here from 1389 to 1550. When Thomas Ram, the Protestant bishop of Ferns, conducted his diocesan visitation in 1615, he found Thomas Gallamore serving as rector and Richard Reigh as vicar. The church, he noted, was in repair. Whatever happened to it afterwards went unrecorded.

The site is reached by a lane running west from the R736, roughly 115 metres in from the road. St. Mary's Well, associated with the same parish dedication, lies about 1.3 kilometres to the south.