California is the heart of the U.S. wine industry, accounting for nearly 90% of American wine production and ranking as the world’s fourth-largest wine producer. Its geography is incredibly diverse, with vineyards stretching from the cool, foggy coasts to the arid inland valleys and the high elevations of the Sierra Foothills. This range of climates and soils allows for a wide variety of wine styles and grape varieties to thrive. Famous wine regions include Napa Valley, known for world-class Cabernet Sauvignon; Sonoma County, with standout Pinot Noir and Chardonnay; Paso Robles, celebrated for bold red blends; and Santa Barbara County, which excels in cool-climate varietals. Each region offers unique terroir expressions, and innovations in vineyard and cellar practices have further elevated the state’s global reputation. Economically, California’s wine industry is a major driver of both state and national revenue. It contributes over $45 billion annually to the state’s economy and supports more than 420,000 jobs across agriculture, tourism, manufacturing, and retail. Beyond its economic power, California has also become a leader in sustainable and organic viticulture, with many wineries adopting environmentally responsible practices. The state’s wine tourism industry is among the most developed in the world, attracting millions of visitors each year to tasting rooms, wine trails, and culinary events. California continues to be a hub of innovation, diversity, and influence in the global wine landscape.