The feeding preferences of graceful kelp crabs (Pugettia gracilis), a species that ranges from Alaska to Baja California, are widely unknown. To quantify their feeding preferences, we used 12 graceful kelp crabs collected from four sites on San Juan Island, Washington and ran choice and no choice experiments using Nereocystis leutkeana and Sargassum muticum. These experiments showed that P. gracilis prefer to consume Nereocystis leutkeana over Sargassum muticum in choice experiments. In no choice experiments, P. gracilis ate equal amounts of Nereocystis leutkeana and Sargassum muticum, indicating that the crabs can exploit both food options. As ocean conditions and environments change, the pressures placed on P. gracilis will change as well. Food sources may shift, predation may vary, and other unknown problems may arise. With changing ocean conditions and environments, this study demonstrates the diet flexibility and adaptability of P. gracilis in the Salish Sea.