Mount Sacred Heart School began as a little school for boys and girls, including a small number of boys as boarders from the surrounding dairy farms. The Sisters of the Sacred Heart built their first convent in 1928 and soon thereafter parents petitioned the Sisters for a little school for their children who had to go quite a distance into the city for their education. The Sisters converted a section of their convent into classrooms in order to provide schooling to their neighbors. Thus, the Sisters welcomed the first class which was the beginning of a long tradition of excellence in the now famed Mount Sacred Heart School.
By the late 1930’s student enrollment had increased to such a number that Sisters and parents soon had to think about plans for a separate building in order to provide adequate space for teaching and learning. By 1937 the school had become a resident and day school exclusively for boys from K through 8th grade. In 1940, after untold hardships, the first unit of Mount Sacred Heart Boys School, a military school for resident and day students was built on a newly acquired tract of land across from the Sisters’ convent on what is now known as Mount Sacred Heart Rd. This was the beginning of what now constitutes Mount Sacred Heart School. In September, the teachers and students began a new school year in the new building and Sr. Rose of Lima Gonzalez was appointed its first Principal.