St Robert Catholic High School vs Thornlea Secondary School
A head-to-head comparison of two secondary schools in Ontario, Canada, 2.0 km apart, using official Canadian 2025 data. The better value in each row is highlighted.
St Robert Catholic High School
Thornhill · Catholic secondary · Grades 9-12
1,705 students
Thornlea Secondary School
Thornhill · Public secondary · Grades 9-12
1,170 students
| Measure | St Robert Catholic High School Thornhill, Ontario | Thornlea Secondary School Thornhill, Ontario |
|---|---|---|
| Success Index (Canada) | 84 Top 10% | 73 Top 25% |
| Province rank | #47 of 766 | #140 of 766 |
| National rank | #47 of 766 | #140 of 766 |
| Sector | Catholic | Public |
| Type | Secondary | Secondary |
| Year range | Grades 9-12 | Grades 9-12 |
| Students | 1,705 | 1,170 |
| Enrolment | 1,705 | 1,170 |
| EQAO Grade 3 | – | – |
| EQAO Grade 6 | – | – |
| EQAO Grade 9 maths | 92% | 78% |
| OSSLT pass rate | 96% | 90% |
| Low-income households | 10% | 11% |
| Parents without a credential | 2% | 1% |
| First language not English | 58% | 57% |
| Special education | 6% | 12% |
| Identified as gifted | 1% | 1% |
| FSA literacy score | – | – |
| FSA numeracy score | – | – |
| FSA Grade 4 literacy score | – | – |
| FSA Grade 4 numeracy score | – | – |
| FSA Grade 7 literacy score | – | – |
| FSA Grade 7 numeracy score | – | – |
| city or town | Thornhill | Thornhill |
| province | Ontario | Ontario |
| Website | stro.ycdsb.ca/ | thornlea.ss.yrdsb.ca/ |
The verdict
- •St Robert Catholic High School scores higher on the Success Index (Canada) (83.8 vs 73.1).
- •St Robert Catholic High School does better on eqao grade 9 mathematics (92% vs 78%).
- •St Robert Catholic High School does better on osslt first-attempt pass rate (96% vs 90%).
- •St Robert Catholic High School is the larger school with 1,705 students compared with 1,170.
- •St Robert Catholic High School is a catholic school while Thornlea Secondary School is a public school, so fees and admission rules differ.
The Success Index (Canada) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
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Frequently asked questions
Is St Robert Catholic High School better than Thornlea Secondary School?
On the Success Index (Canada), St Robert Catholic High School ranks higher (83.8 vs 73.1 out of 100). The index is built from published results and context data, not from teaching quality or fit, so visit both schools before deciding.
How far apart are St Robert Catholic High School and Thornlea Secondary School?
About 2.0 km in a straight line, between Thornhill and Thornhill in Ontario.
Which has the better Enrolment?
St Robert Catholic High School: 1,705. Thornlea Secondary School: 1,170. Students enrolled in the latest published year.
How do St Robert Catholic High School and Thornlea Secondary School rank in Ontario?
St Robert Catholic High School is 47th of 766 and Thornlea Secondary School is 140th of 766 among secondary schools in Ontario on the 2025 Success Index (Canada).