Sobon Estate Winery - Credit: Wikimedia Commons
Sobon Estate winery, located in Plymouth, Amador County, is the oldest winery in California and is registered as California Historical Landmark number 762. It was started in 1856, by Adam Uhlinger a Swiss immigrant who is one of the people credited with bringing Zinfandel to America.Sullivan, Charles., Zinfandel: A History of a Grape and Its Wine, Berkeley and Los Angeles, California: University of California Press, 2003 This also makes Sobon Estate the longest continuous producer of Zinfandel in the state of California. Read more on Wikipedia
Source: en.wikipedia.org