Holbrook Mitchell is comprised of sedimentary, gravelly alluvial earth with rock. Vines struggle in Holbrook Mitchell’s shallow dirt to produce low yields of complex berries. Cool breezes and fog from San Pablo Bay foster long times on the vine, perfect for complex, age-worthy Cabernet Sauvignon and Cabernet Franc.

Marking the warmest year since 2008, the 2015 growing season set a record for early bloom. Drought conditions persisted, and rainfall was erratic, with most of the much-needed rain falling at the end of the previous year and supplemented by only a single storm in February, which was enough water to sustain the vines. Cooler conditions during flowering ultimately lead to a smaller number of berries on each cluster and lower than average yields. Warm summer months led to advanced veraison, which was followed by perfect ripening conditions. Harvest began in early September. Heat spells and continued warmth allowed for the berries to be steadily picked at their ideal maturity. The harvest was completed mid October.