Trefethen Family Vineyards is a pioneering, family-owned winery established in 1968 in the Oak Knoll District of Napa Valley. They are known for their estate-grown wines, particularly Chardonnay and Cabernet Sauvignon, and their commitment to sustainable viticulture. The winery operates with a deep respect for the land and a focus on producing wines that reflect their unique Napa Valley terroir.