Warm days and cold nights make for a long ripening season, but the Bio Bio’s higher rainfall, strong winds, and broader extremes make for more challenging conditions than those of Chile’s more northerly regions. Winegrowing here requires more patience, skill, and nerve than in other valleys, but a daring few have taken the plunge and invested in new plantations of cool-climate varieties such as Sauvignon Blanc, Chardonnay, and Pinot Noir. Early results show their efforts paying off in exciting wines with naturally fresh acidity.