This paper examines the impact of Sunday blue law reforms on small-scale wineries in the United States. Using establishment-level data from 2000 to 2020, we employ an event-study framework to analyze the impact of changes in Sunday alcohol sales regulations across states on the performance of small wineries. We find that deregulation is associated with substantial declines in the performance of small wineries. On average, sales fell by 25.5%, employment declined by 7.8%, and survival rates dropped by 5.2% following the repeal of Sunday sales restrictions. These adverse effects are particularly pronounced among the smallest wineries and those located in metropolitan counties. The results suggest that while deregulation increased consumer access to alcohol on Sundays, it also intensified competition from large-scale retail outlets, thereby undermining the direct-to-consumer sales channels that are critical to small wine producers.