With the repeal of Prohibition and the reemergence of a domestic beer market, Willamette Valley farmers once again caught “hop fever.” Acreage expanded to its peak level in history by 1936. This chapter explains how hop farmers became more organized and initiated the first successful hop grower organizations. These organizations achieved success in marketing controls and improving the region’s reputation. Simultaneously, Willamette Valley growers successfully expanded the celebratory nature of the hop harvest by implementing a Hop Fiesta to attract workers. The event became one of Oregon’s most important annual cultural affairs, as growers drew in thousands of harvest workers with the promise of clean camping, live music, dancing, parades, and even the crowning of a Hop Queen. Despite this success in the 1930s, however, a botanical disease, called downy mildew, had crept its way to the Pacific Coast, leaving many hop fields in ruins. By 1943, Oregon relinquished its hold as the national leader in hop production.