Initially, the school consisted of grades one to six. Grades seven and eight were added in its second year, Kindergarten began in the 1983-84 academic year, and the pre-Kindergarten program started in the fall of 1985. The school reached its present completement of grades with the addition of a pre-school, three-year-old program in 2017.
In 1999, St. Mary’s school added a primary science lab and complete primary science curriculum for grades pre-K through fifth—the only one of its kind in the area and still one of the few in the entire state. A total physical renovation of the school, which included a new gymnasium, was completed in September of 2000.
In 2010, St. Mary’s School was declared a Blue Ribbon School of Excellence by the U.S. Department of Education, placing it in the top 10% of schools in the nation academically.