The Sacramento Office of Education, in conjunction with the CSforCA coalition, developed this model of professional development building on the work of several partners. Summer of CS was inspired by the CSPDWeeks hosted by the Colorado School of Mines, which included workshops offered by Exploring Computer Science (ECS), MobileCSP, and Bootstrap, as well as Code.org’s TeacherCon. These week-long experiences have made a significant impact on the K-12 Computer Science landscape by supporting teachers from across the nation. However, counselors, administrators, curriculum specialists and other stakeholders have been unable to participate in these workshops. Moreover, the national scope of previous CSPDWeeks limit the opportunity for regional collaboration. While recognizing the roots of CSPDWeek, the Summer of CS was designed for regional implementation and to include multiple stakeholders.