Howell Mountain AVA
| Wine region | |
| Type | American Viticultural Area |
|---|---|
| Year established | 1984 1987 Amended |
| Years of wine industry | 148 |
| Country | United States |
| Part of | California, Napa County, Napa Valley AVA |
| Other regions in California, Napa County, Napa Valley AVA | Atlas Peak AVA, Calistoga AVA, Chiles Valley AVA, Diamond Mountain District AVA, Los Carneros AVA, Mt. Veeder AVA, Coombsville AVA, Oak Knoll District of Napa Valley AVA, Oakville AVA, Rutherford AVA, Spring Mountain District AVA, St. Helena AVA, Stags Leap District AVA, Wild Horse Valley AVA, Yountville AVA |
| Precipitation (annual average) | 40.74 in (1,034.80 mm) |
| Soil conditions | Aiken and Forward Group |
| Total area | 14,080 acres (22 sq mi) |
| Size of planted vineyards | 600 acres (243 ha) |
Howell Mountain is an American Viticultural Area (AVA) located in Napa County, California and the first sub-AVA within the internationally-acclaimed Napa Valley. The 14,080 acres (22 sq mi) region was effectively recognized on January 30, 1984 by the Bureau of Alcohol, Tobacco and Firearms (ATF), Treasury after reviewing the petition submitted by members of the grape-growing and wine-producing industries in the area proposing to establish a viticultural area named "Howell Mountain."
The area is located in the Howell Mountains within the Vaca Range on the northeast side of valley around the town of Angwin and overlooks the town of St. Helena. The boundaries of the AVA are dictated by vineyards located at elevations at and above 1,400 feet (430 m).