Oak Knoll District of Napa Valley AVA
| Wine region | |
| Other names | OKD |
|---|---|
| Type | American Viticultural Area |
| Year established | 2004 |
| Years of wine industry | 146 |
| 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, Howell Mountain AVA, Los Carneros AVA, Mt. Veeder AVA, Coombsville AVA, Oakville AVA, Rutherford AVA, Spring Mountain District AVA, St. Helena AVA, Stags Leap District AVA, Wild Horse Valley AVA, Yountville AVA |
| Growing season | 273 days |
| Climate region | Region I-II |
| Heat units | 2900 GDD units |
| Precipitation (annual average) | 28 to 30 in (710–760 mm) |
| Soil conditions | Fine, gravelly clay, silt loam and loam |
| Total area | 8,300 acres (13 sq mi) |
| Size of planted vineyards | 4,200 acres (1,700 ha) |
| No. of vineyards | 41 |
| Grapes produced | Cabernet Franc, Cabernet Sauvignon, Chardonnay, Malbec, Merlot, Pinot noir, Riesling, Syrah, Viognier, Zinfandel |
| No. of wineries | 50 |
Oak Knoll District of Napa Valley is an American Viticultural Area (AVA) located within California’s renown landform Napa Valley. The wine appellation was established as the nation’s 151st, the state’s 91st and the county's thirteenth AVA on February 25, 2004 by the Alcohol and Tobacco Tax and Trade Bureau (TTB), Treasury after reviewing the petition submitted by the Oak Knoll District Committee proposing a viticultural area in the southern end of the Napa Valley in Napa County, California known as "Oak Knoll District."
The appellation is completely within the established Napa Valley viticultural area in close proximity to San Pablo Bay resulting in a climate that is cooler and more moderate than any region in Napa Valley other than the Los Carneros AVA. The AVA has more vines planted to it than any other wholly contained appellation within the Napa Valley. A wide variety of wine grapes do well in this climate, including varieties not widely grown in other parts of Napa Valley, such as Riesling and Pinot noir. The district is planted largely to Merlot, Chardonnay and Cabernet Sauvignon, in that order. Oak Knoll District Chardonnay has a reputation for a restrained, delicate style.