91 Points from Wine Enthusiast! Stout Vineyard is located in the Howell Mountain appellation, one of the Napa Valley’s most sought-after, ultra-premium winegrowing regions. As a result of its topography, soils and climate, Howell Mountain has distinctly different grape-growing conditions than the valley floor. This 35-acre vineyard is planted to Cabernet Sauvignon, Merlot, Cabernet Franc, Zinfandel, Petit Verdot, Grenache and Syrah. The Stout Vineyard also has 300 mature olive trees that were planted at the turn of the 19th century.