California is the largest and most important wine region in the United States. The Japanese current brings cold water to the Central Pacific Coast from Alaska. This Central Coast region, located in the state of California. It has winds that combine with the current to create refreshing fogs that tend to migrate to the east of the mountains. As elsewhere, the valleys are colder than the hills on its flanks. The climatic variety of this region allows the growing and production of almost all kinds of varieties and styles of wines. 
The main varieties grown in California are Cabernet Sauvignon, Pinot Noir, Merlot, Syrah and Zinfandel for red grapes, and to a lesser extent Barbera, Garnacha. For the white varieties, the two most important are Chardonnay and Sauvignon Blanc.