Rolling hills blanketed in lush vineyards, glasses clinking at sun-drenched tastings, and a booming industry that turned California into the world's fourth-largest wine producer. From the 1990s through the early 2010s, the Golden State's wine scene was a veritable gold rush. Fueled by Baby Boomers' insatiable thirst for sophisticated sips, production soared—reaching peaks of over 4 million tons of grapes crushed annually in the mid-2010s.