Streetsville Secondary School was opened in 1958. The school currently has approximately 900+ students enrolled, with about half enrolled in the French Immersion program. The school features a main floor and a second floor on its north side which consists of mostly English, Math, Geography and history classes. It has two gymnasiums, one large in size, and the second being half the size of the first. When the school first opened, the smaller gym was originally intended to be a swimming pool. The school also has a library, which was renovated and expanded, a weight room, and a
cafeteria. The school has several unusual classes including Grade 11 and 12 Photographic Arts, the unusual aspect being the darkroom available for student use, one of the last remaining in the Peel school system. Also available to students is Music Production, a course teaching the recording and mastering of music using computers. In 2005, the
French immersion programme for students was introduced at Streetsville Secondary School where students can learn bilingualism in Canada. The courses offered are: French Immersion (Grades 9-12), Science, and Geography of Canada (Grade 9), Contemporary Canadian History, Career Studies, and Civics (Grade 10), World History to the 16th Century (Grade 11), and Canadian and World Issues: A Geographic Analysis (Grade 12). Up until the summer of 2005, the school had 13 portable buildings. However, in 2005,
Mississauga Secondary School opened in the area and about half of the grade 9 and 10 students attending Streetsville had to switch schools due to boundary changes. This dropped the overall attendance by about 500, and all of the portables except one were removed. The sole portable remaining was used as an extension of the school's drama room until it was removed in 2006 due to budget cuts. A $7 million renovation/expansion during the summer of 2015 and the 2015–16 school year included a 6-classroom extension and an elevator. ==Sports==