Turnbull has been rooted in Napa Valley's Oakville appellation for over 35 years, operating from its original estate winery with four dedicated vineyard sites. The winery focuses almost exclusively on Cabernet Sauvignon - estate-grown, lot-sorted, aged in 100% French Oak, and bottled on-site when the wine is ready. Their ethos is captured in one phrase: "dirt to bottle" - no shortcuts, no outside sourcing, no compromise on process.