Although the Central Valley of California is home to two of the largest viticultrual areas in California, Madera and Lodi, and its grape production for 2016 accounted for over $5.5 Billion dollars, the Central Valley is not an AVA or generally recognized  as a completely distinct American Viticutrual Area. Its size at 18,000 square miles, 450 miles long and up to 60 miles wide encompassing all or parts of 18 counties that include Shasta County in the north and Kern County in the south make it enormous. Both the north and southern parts of the Central Valley have hot Mediterranean climates. 

The southern part is cool and damp in winter, when frequent ground fog known regionally as "tule fog" settles in and obstructs vision to travelers. Most lowlands of the Central Valley are prone to flooding. The Great Flood of 1862 was the worst flood that the Central Valley has experienced in recorded history, flooding most of the valley and putting some places as much as 20 feet under water.  The valley produces over a third of the country’s vegetables and two-thirds of the country’s fruits and nuts. The upper soil layer is an alluvial loam with the sub layer being a clay loam.

 There are a total of 17 American viticultural Areas (AVA) in the entire Central Valley region, and they are: Alta Mesa AVABorden Ranch AVACapay Valley AVAClarksburg AVAClements Hills AVACosumnes River AVADiablo Grande AVA, , Dunnigan Hills AVAJahant AVALodi AVAMadera AVAMerritt Island AVAMokelumne River AVARiver Junction AVASalado Creek AVASloughhouse AVAand Tracy Hills AVA.


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