What percentage of U.S. wine is produced in California on average?

California is the nation’s number one wine state and the source of 80% of U.S. wine production. California wine makes a significant contribution to the nation and all 50 states by providing quality jobs, bolstering economies through tourism and taxes, and enhancing communities through environmental stewardship and charitable giving. The industry generates $170.5 billion in annual economic activity in the whole country and employs almost 1.1 million Americans.

Source: Wine Institute