Forty miles southeast of Adelaide, Langhorne Creek is defined by the Mount Lofty Ranges to the west and north, and Lake Alexandrina to the south. On average, around 20-50m above sea level. A flat flood-plain with minor undulations, due to wind forming sand loam peaks.
Despite its flat, dry terrain, Langhorne Creek is milder and cooler than McLaren Vale due to south-west sea breezes across Lake Alexandrina. Annual rainfall is around 15 inches, but only 6 inches falls during the October to March growing season. Thus, irrigation is necessary, traditionally from flooding annually and flood plains, but more recently with drip irrigation on higher ground.