Cactus High School is public secondary school located in Glendale, Arizona, United States, part of the Peoria Unified School District. The school opened its doors in August 1977. It is the district's smallest high school, with approximately 1,300 students. In 1978, the first Cactus High School students, 1980 graduates, transferred from Peoria High School's campus during their sophomore year into the current building.