Drawing an analogy to one of California's great historic booms, this article begins with the question, "What is happening in California's young adult (YA) library services?" The answer is a plethora of exciting new teen resource enhancements, including new dedicated YA specialist positions, space design innovations, enhanced in-service training capacity, increased national leadership, supportive administrations, and a dramatic increase in YA instructional offerings in library school programs. Taken together, these myriad changes have brought a "California YA Gold Rush" that has heightened expectations for YA services across the state, delivered dramatic service outcomes, and carved out a new Gold Standard for professional YA services for the whole nation. In the process, young adults have been transformed into California libraries' new "gold minors"!