Hunterston Estate comprises of aprox 770 acres of land but only 290 acres are outrightly owned by the Hunter family that being 40 acres as shown in white around the castle and 250 acres shown in yellow around Goldenberry and Campbelton Hills.

The rest of the land is owned through compulsory purchased by the various industrial companies that surround the castle but through arrangements Hunterston Estate is allowed to farm this area.