- 1983-1984: Bishop Garriga Middle Preparatory School was initially established as a Junior High school located at the Corpus Christi Minor Seminary.
- 1986-1987: Bishop Rene H. Garcia made the decision to move the Junior High to a nearby elementary school, thus allowing it to establish its own identity.
- 1988–1989: The Junior High school moved to a four-acre allotment next door to the Corpus Christi Minor Seminary. The enrollment of the school doubled during each of its first three years as a separate institution, with the actual classrooms being housed in three portable buildings.
- Spring of 1991: The school staff petitioned the Diocesan Board of Education to change the format of the school to a middle school concept, both in philosophy and practice, in order to better serve the needs of the community of students being served. As a result, the sixth grade was added for the ’91 – 92 school year, and the name of the school was changed to Bishop Garriga Middle School. Additionally, a new classroom/office building was constructed and dedicated during that school year, and now serves as the cornerstone for the campus.
- Fall of 1997: Bishop Garriga Middle School obtained the nearby facilities consisting of the John Paul II Library, the gymnasium, the cafeteria and use of the Chapel. The swimming pool, tennis courts, track and softball/baseball fields helped to facilitate and enrich the physical education program and extra curricular activities.
- Spring of 2006: The school petitioned the Diocesan Advisory Council permission to modify the name of the school by adding the word preparatory. Permission was granted and the name of the school was modified to Bishop Garriga Middle Preparatory School.
- 2007-2008: Four portable buildings were added to accommodate the number of students being served.
- Spring of 2008: The John G. and Stella Kenedy Center for Social and Cultural Activities was built. This addition helped to enhance the Wellness program and enabled the school community to plan and host additional activities to meet the needs of the growing population.
Bishop Garriga Middle Preparatory School families are attracted to the community because of the broad program offered to develop caring, responsible, and accountable adolescents and preparing them for holiness and success.