Cask 307 is a boutique winery located in Madison, Ohio, serving as a gateway to the Grand River Valley wine region. Opened in June 2019, it offers a sophisticated tasting room experience with wines made from European varietals grown locally. Visitors can learn about the grapes, engage with experts, and enjoy locally crafted beers, cocktails, charcuterie boards, and flatbreads. The winery features indoor and outdoor seating, hosts live music, and offers special events like opera night dinners. Cask 307 emphasizes modern wine-growing techniques and contemporary styles, representing the future of the Grand River Valley Appellation.