June 15, 1973 — Choral group performs at Sierra Vista Junior High School graduation.

Sierra Vista Junior High School, a component of the William S. Hart Union High School District, opened in the fall of 1964 at 19425 W. Stillmore St. in North Oaks subdivision. The north end of campus had been part of the Schmidt family's 6-S Ranch Airpark property in the 1940s and 1950s. At first, Sierra Vista's graduates went on to Hart High; after Canyon High School opened in September 1968, Sierra Vista became Canyon's feeder school. Sierra Vista initially housed Canyon Country's 7th through 9th graders; it switched to grades 7-8 in the 1970s, as did the other Hart District middle schools.