Of these, three Sisters remained in Tasmania and at the request of Dean Dundas, opened a school for girls and boys in October 1892.

The son of Bishop Montgomery was Bernard Montgomery, who attended the school while living in Tasmania[8] and went on to be the victorious British Army field marshal in the Second World War organising the D-Day Invasion at Normandy and taking the surrender of Nazi Germany in 1945.

Sister Phyllis became the principal in 1895, by which time the number of enrolled students had risen to 71, including 6 boarders.

The students did not have a uniform as such, but were required to wear a long dark coloured skirt and a white blouse.

At some time during the 1920s some girls began to wear a brooch with the initials C.C.E.S., which stood for Collegiate Church of England School.

In 1929 Tremayne was demolished to make way for a larger, two-storey, purpose-built building, which housed classrooms downstairs and boarding accommodation upstairs.

It was very different from the traditional navy blue tunic and black stockings, and much more comfortable to wear in the warmer months.

New school values of Courage, Compassion and Integrity were cemented as well as a new vision, "To empower every student to embrace the fullness of life".

Collegiate has also updated some learning methods, with a wide range of new electives such as Marine Environment, and Athlete development.

Each year, these houses compete against each other in physical and mental contests for the 'House Cup', donated by the graduating class of 1958.

Year 9s choose three elective subjects a semester and study a core of Science, English, SoSE, Maths, Faith and Life and Health/Physical Education (HPE).

Sports offered at Collegiate include, soccer, hockey, basketball, netball, rowing, orienteering, touch football, rugby, afl, water polo, tennis, mountain biking, athletics, cross country running, swimming, surfing, cricket, volleyball and sailing.

In 2011, Nicolaas Ockert Bester, who was a science teacher and head of maths and science at St Michael's Collegiate, was convicted and jailed by the Tasmanian Supreme Court for two years and ten months for a sex crime against a 15-year-old girl student, Grace Tame, the year prior.

[13][14][15] In 2017, Raynor Ian Bartsch, 56, who was a physical education teacher and head of sport at St Michael's Collegiate between 1989 and 1993, pleaded guilty and was convicted and sentenced to two years in prison for maintaining a sexual relationship for eight weeks in the 1990s with a young person (a 16-year-old girl student).

[16][17] During the trial, the court heard that the school was aware of allegations, but allowed the teacher to finish the year teaching, working at the pool, and coaching.