Casa Grande High School, home of the Gauchos, is a public school located in Petaluma, California. CGHS is part of the Petaluma City Schools District with approximately 1,700 students and 20 varsity sports teams. Casa Grande High School believes that education is a shared responsibility involving students, staff, family and the broader community. Our mission is to foster strong relationships and to build a safe, inclusive, and collaborative environment where all students are engaged and challenged to achieve their highest potential.