Castle Park High School opened in September 1963 to serve the growing suburban population of southwest Chula Vista. Over the decades, the school has undergone multiple renovations, including modernized classrooms in 2006 and ongoing campus improvements under Proposition O funding. In 2007, the school became the subject of a
Title IX lawsuit,
Ollier v. Sweetwater Union High School District, filed by female softball players who alleged unequal athletic opportunities and claimed that the school retaliated against them and their coach for raising these concerns. In 2009, the
United States District Court for the Southern District of California and
U.S. District Judge M. James Lorenz ruled in favor of the plaintiffs, which pays nearly $500,000 in legal fees, finding the district in violation of Title IX. In response, the district invested in improved athletic facilities, including $1.6 million in softball field renovations completed in 2023. 2012, the
United States Court of Appeals for the Ninth Circuit upheld a 2012 ruling that the Sweetwater Union High School violated Title IX. October 3, 2011, CPHS's former
principal, Diego Ochoa, and a
Vice-principal, stepped down after $21,583 was taken from nine
student clubs without advisers' knowledge. In a related matter, Ochoa facilitated over 115 unauthorized grade changes after a credit recovery session, which involved eliminating D's and F's from student transcripts, in violation of district policy. Ochoa was initially in consideration for a promotion to executive director of middle schools; however, he was reassigned to the principal role at
Bonita Vista Middle School before his resignation. == School structure ==