California wines are renowned for their diversity and quality, produced in various regions such as Napa Valley, Sonoma County, and Paso Robles. The state's Mediterranean climate, with warm days and cool nights, allows grapes to ripen perfectly, resulting in rich flavors. The most popular grape varieties include Chardonnay, Cabernet Sauvignon, and Zinfandel. California is the leading wine-producing state in the United States, contributing nearly 90% of the country's wine. The state's innovative winemakers often blend traditional techniques with modern practices, making California wines highly sought after worldwide.