The California wine calendar highlights key events and activities throughout the year in the state's vibrant wine regions. It includes grape harvest seasons, wine festivals, and tasting events, providing wine enthusiasts with opportunities to explore local vineyards and wineries. Typically, the grape harvest occurs from late summer to early fall, with peak times varying by region and grape variety. Major events, such as the Napa Valley Wine Auction and Paso Robles Wine Festival, attract visitors and showcase the diverse offerings of California's wine industry, celebrating its rich heritage and innovation.