The Yorkville Highlands AVA is an American Viticultural Area

American Viticultural Area

An American Viticultural Area is a designated wine grape-growing region in the United States distinguishable by geographic features, with boundaries defined by the Alcohol and Tobacco Tax and Trade Bureau , United States Department of the Treasury....

 located in southern Mendocino County

Mendocino County, California

Mendocino County is a county located on the north coast of the U.S. state of California, north of the greater San Francisco Bay Area and west of the Central Valley. As of the 2010 census, the population was 87,841, up from 86,265 at the 2000 census...

, California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

. The Yorkville Highlands separate Sonoma County

Sonoma County wine

Sonoma County wine is wine made in Sonoma County, California, USA. County names in the United States automatically qualify as legal appellations of origin for wine produced from grapes grown in that county and do not require registration with the United States Department of the Treasury, Alcohol...

's Alexander Valley AVA from Mendocino County

Mendocino County wine

The Mendocino County wine is an appellation that designates wine made from grapes grown mostly in Mendocino County, California. The region is part of the larger North Coast AVA and one of California's largest and most climatically diverse wine growing regions...

's Anderson Valley AVA

Anderson Valley AVA

The Anderson Valley AVA is an American Viticultural Area centered around the Anderson Valley in Mendocino County, California. It is known primarily for its Pinot Noir and sparkling wine production. Lying to from the Pacific Ocean, the AVA is prone to wide diurnal temperature variation of between...

. The soil in the Yorkville Highlands is rocky with a high gravel content, which provides excellent drainage. During the day, the climate is cooler than Alexander Valley but warmer than Anderson Valley, while at night the highlands are cooler than the surrounding areas.