Wallis Family Estate is a small Cabernet Sauvignon producer in the Diamond Mountain District AVA near Calistoga. The estate traces to Edward J. Wallis, who bought the 85-acre property in 1975, and the family has farmed it since. Only a small part of the land is planted: about 13 acres of vines across eight blocks on the mountain's slopes, where volcanic soils and elevation give the wines concentrated dark fruit and firm structure. The lineup is built around Cabernet Sauvignon, led by the Denali Estate Cabernet Sauvignon, and includes a Napa Valley Cabernet Sauvignon, Diamond Terrace, Haas Vineyards, Seraphim, Little Sister and an Estate Cabernet Sauvignon. Production is limited and sold mainly direct to customers. Diamond Mountain is one of Napa Valley's smaller mountain appellations, home to only a handful of wineries, so Wallis is a useful producer to know for readers who want to explore the district's distinctive, age-worthy style of Cabernet.