Turnbull produces Cabernet Sauvignon from Oakville, the heart of Napa Valley's most prestigious red wine territory. The region's gravelly benchland and moderate climate create conditions for Cabernet of structure and depth. The winery's portfolio centers on three flagship expressions: Pierra Cabernet Sauvignon, Black Label Cabernet Sauvignon, and Leopoldina Cabernet Sauvignon. These wines have been assessed by Wine Advocate, Wine Enthusiast, Decanter, Wine Spectator, and Falstaff. Oakville's terroir—marked by well-drained soils and diurnal temperature swings—suits Cabernet's ripening arc, yielding wines with ripe fruit and tannin definition characteristic of the appellation.