Trefethen Family Vineyards is in the Oak Knoll District of Napa Valley. It was founded by John and Janet Trefethen in 1973. John’s parents, Eugene and Catherine, had retired to Napa Valley in 1968 and had purchased several small farms and a rundown winery. Eugene had been an executive with Kaiser Industries and his retirement plan was to sell grapes. John, however, started making wine as a college student and in 1973 he and his wife produced a debut commercial vintage. The 560-acre estate is known for its Chardonnay, though it also produces Cabernet Sauvignon, Pinot Noir, Riesling, Viognier, Cabernet Franc, and blends.