Mount Barker is located on the eastern escarpment of the Adelaide Hills, 30 kilometres directly east of the cool Piccadilly Valley. Petaluma pioneered Mount Barker when it planted Viognier and Shiraz on the micaceous schist soils at altitudes of 350 to 450 metres. Directly to the north east the hot dry plains have a warming influence on Mount Barker, whilst the cold southern ocean to the south provides a cooling influence ensuring the retention of natural acid and elegant flavours in the finished wines.