1889- When this school was first established, it was then only a wooden building with only 8 pupils.
1898- The Perak Government started to face problems with this school, which now had an enrolment of 22 pupils. The school was known as the Government
Girls' School.
1899-After several discussions between Mrs. William Treacher, the wife of the British Resident, and Bishop James Thoburn, the Perak Government handed this school over to the Methodist Mission on 4th May, 1989. During this year also, the e enrolment rose to a total of 28 pupils with Mrs. Mary Carr Curtis, wife of a Methodist Missionary from Penang, as the first principal.

1914 - 1918- despite the First World War, this school carried on and the enrolment surged up to 108 pupils. Boys were admitted in the early years (even up to Standard Four).
1924- The First Cambridge School Certificate Class was organized.
1929- The Public Work Department allowed the school to rent the bungalow near the junction of Museum and Walker Road.
1934- Presentation of the World Flag to the first Taiping Guide Company of Lady Treacher Girls' School.
1935- Miss Della Olson became the principal.
1941- The school built the main building which consisted of 13 classrooms, an assembly hall an office, staff room, Music and Domestic Science rooms. This building was officially opened by D.Y.M.M. Paduka Seri Sultan Perak, Sultan Abdul Aziz Ibni Almarhum Musa K.C.M.C.K.B.C.
1949- During this year, this school had a new block consisting of 6 classrooms, and a sports field was obtained from the Perak Government.