Operating as a twelve-year (the upper grades were limited to girls) boarding and day school serving families in Southern Oregon and Northern California, St. Mary's graduated its first student in 1871.

[2] In 1971, when the Sacred Heart Parish determined it could no longer financially support two schools, a group of supporters raised funds and gained permission from the Archbishop to incorporate as an independent, Catholic school, the first in Oregon.

The school offers 24 Advanced Placement courses, including four foreign languages: Latin, German, Spanish, and Mandarin.

St. Mary's is a member of the Oregon School Activities Association and participates in the Far West League.

The school has won numerous state championships in various sports in Class B, 1A, 2A and 3A since 1958. https://smschool.us/ - Home http://smcathletics.us/ - Athletics