Castle Rock Sourdough is a small-batch bakery in Fountain City known for its authentic sourdough breads made with a 36-hour hand-raised process and freshly milled wheat. Sold from a self-serve roadside “Bread Hut,” offerings include classic white, rye, jalapeño cheddar, and seasonal focaccia. Celebrated as a Driftless Region hidden gem, it’s a must-visit for artisanal bread lovers in Buffalo County.