Howell Mountain

Howell Mountain is located northeast of St. Helena, above the Silverado Trail, with the Napa Valley to the west and Pope Valley to the east. With its high elevations, the mountain avoids the influence of fog that blankets the valley floor beneath, creating a climate that is cooler than most of Napa Valley during the day, but warmer at night. Because of this, Howell Mountain grapes have a character distinct from those grown on the Napa Valley floor, and have led to the region being recognized in 1983 as Napa Valley's first sub-appellation.

The appellation encompasses around 14,000 acres, yet only 600 acres are planted due, in part, to the rugged nature of the region. The soils of this area are mostly well-drained tuff and volcanic rock. Water retention is poor, producing vines with low vigor and deep roots. These conditions are ideal for growing grapes that are small, tightly clustered and powerfully concentrated, for intense fruit flavors in the wines. In addition, the grapes develop thick skins that yield rich tannins. Tannins are important in the production of good red wines as they provide flavor, structure, and texture.