Borders: About 2 miles east of Lauder, 0.3 miles south-west of A697 at Thirlestane village, east of the Boonsdreigh Water.
Ruin or site NT 564474 OS: 73 TD2 6QS
Little remains of a tower and courtyard, except the vaulted basement. The tower consisted of a rectangular block and a wing containing a stair.
‘Thirslstaine’ is marked prominently on Blaeu’s map of Berwickshire.
The lands were originally held by the Thirlestane family but passed by marriage to the Maitlands in the 13th century. The castle is said to have been burnt out in the 1570s. The Maitlands moved to Thirlestane Castle, near Lauder, about 1595.