It is located in the Roman Catholic Diocese of Springfield in Massachusetts, which assumed the financial management of the formerly-parochial school and its programming in August 2019.

St. Mary's curriculum offers honors and advanced placement level courses in Math, Science, World Language, and English.

Troy Collins, baseball coach of thirteen years for the High School and St. Mary's alumni, asserted that he was told the decision was because of monetary issues.

Bob Wilcox, Class of 1988, was a key figure in the organization's efforts: Creating a Facebook group titled "Save Saint Mary's High School" which would eventually grow to over 250 members.

[8] Following the widespread calls for Saint Mary's to stay open, the bishop agreed to give the school another year, with the stipulation that they enroll Freshman classes of more than 20 students.