Ancaster High School is a member of the Hamilton-Wentworth District School Board. The school's enrolment for 2014 was 3923, with Korean, Urdu, Mandarin, Russian, Spanish, and Arabic being languages of note spoken by students along with English. The Ontario Secondary School Literacy Test (OSSLT) assesses Grade 10 students' skills in reading and writing. Successful completion of the test is one of 32 requirements students need to attain to receive an Ontario Secondary School Diploma. The school also offers special education classes as well as an ESL program. Ancaster High School is a registered International Baccalaureate School.

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Ancaster High School can be divided into two sectors—the East and West Wings. The West Wing is on the right side of campus with a visible white sign stating “West Wing.” Locations in the West Wing include The auditorium, Chemistry Labs, Science Classes, French Classes, and the West Cafeteria. What separates the two sectors is a passage known as “The Tunnel.” The East Wing is much older and includes Gym A/B, Gym C, East Cafeteria, Main Office, Math Classes, English Classes, Geography/History classes and several elective classes.

The Turf refers to the sizeable multipurpose field behind the school. It was completed on December 1, 2020, and had a budget of $1.25 million. The Turf was built for Ancaster High’s Football Team but is also used for gym classes, soccer, and track and field. The Turf was also used for the recent Grade 9 Night on September 15, 2022, for activities.