Gallo Winery and Randall Grahm announce exclusive collaboration Many varieties reached maturity simultaneously, leading to a compressed harvest, whilst some wineries are expected to continue picking grapes into late November.Ĭalifornia accounts for approximately 80% of total US wine production, making it the world’s fourth-largest wine-producing region, and yields are reportedly up in many of its most notable sub-regions. Harvest began late throughout California, running anywhere from two weeks to a full month behind normal timing. Following a late harvest and thus extra ripening time, Californian producers are predicting the 2023 vintage will be one of the ‘finest in years’, according to the Wine Institute – the membership board representing Californian wineries.