Best High Schools in Thornhill, Ontario

7 schools ranked by EQAO Grade 9 Math and Grade 10 OSSLT · EQAO Performance Index

7 schools · ← All Ontario Secondary Schools

Local school searchCompare 7 Thornhill high schools and secondary schools in one table.
City and Ontario rankUse local rank for nearby comparisons and Ontario rank for province-wide context.
Current leaderSt Robert Catholic High School is the top-ranked school on this page.
Ontario RankBoard RankCity RankSchoolBoardTypeOverall Score2023‑242022‑232021‑223‑Year ChangeWebsite
611St Robert Catholic High SchoolYork CDSBCatholic9.59.59.49.1+0.4 ↑Visit
3562Thornlea Secondary SchoolYork Region DSBPublic8.88.88.88.1+0.7 ↑Visit
65113Thornhill Secondary SchoolYork Region DSBPublic8.58.58.17.9+0.6 ↑Visit
93184Stephen Lewis Secondary SchoolYork Region DSBPublic8.28.28.37.9+0.3 ↑Visit
95195Hodan Nalayeh Secondary SchoolYork Region DSBPublic8.28.28.57.8+0.4 ↑Visit
143216Westmount Collegiate InstituteYork Region DSBPublic7.97.98.17.90.0 →Visit
20697St Elizabeth Catholic High SchoolYork CDSBCatholic7.57.57.76.4+1.1 ↑Visit

Ranking Method

Thornhill secondary schools are ranked with the School-Ranking.com EQAO Performance Index. The index uses official EQAO Grade 9 math and Grade 10 OSSLT results, shows the latest available score, and keeps recent-year scores and three-year change visible so readers can compare both performance and trend.

Frequently Asked Questions

What is the top-ranked secondary school in Thornhill, Ontario?

St Robert Catholic High School is currently the top-ranked secondary school in Thornhill on this page, based on the latest available EQAO Performance Index with an overall score of 9.5.

How are Thornhill secondary schools ranked?

Thornhill schools are ordered by Ontario rank and local city rank using official EQAO Grade 9 math and Grade 10 OSSLT results and the site EQAO Performance Index.

Can I compare public, Catholic, and French-language schools in Thornhill?

Yes. The table includes the school board and school type where available, so local families can compare public, Catholic, French-language, and other public-system options together.

Does the city rank replace the Ontario rank?

No. City rank shows how a school compares locally, while Ontario rank shows its position across the full provincial dataset.