The primary vineyard used for the 1984 Robert Mondavi Winery Cabernet Sauvignon Reserve was the historic To Kalon Vineyard, which is located on the Oakville Bench in Napa Valley. For that specific 1984 vintage, 65% of the grapes were sourced directly from the To Kalon estate surrounding the winery, while the remaining percentage was carefully selected from other premium Napa Valley vineyards to complete the reserve blend.