Best secondary schools in Upper Canada DSB (2025)
Secondary (high) schools and combined schools. Ranked by the Success Index (Canada) from official Canadian data; 21 schools in Upper Canada DSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.
- 173North Grenville District High SchoolKemptville · Public Secondary83% OSSLT pass rate · 605 students
- 268Gananoque Secondary SchoolGananoque · Public Secondary89% OSSLT pass rate · 335 students
- 367Charlottenburgh and Lancaster District High SchoolWilliamstown · Public Secondary96% OSSLT pass rate · 200 students
- 467Almonte District High SchoolAlmonte · Public Secondary90% OSSLT pass rate · 380 students
- 565Rideau District High SchoolElgin · Public Secondary79% OSSLT pass rate · 295 students
- 661North Dundas District High SchoolChesterville · Public Secondary91% OSSLT pass rate · 380 students
- 760Rockland District High SchoolRockland · Public Secondary84% OSSLT pass rate · 340 students
- 859Carleton Place High SchoolCarleton Place · Public Secondary88% OSSLT pass rate · 670 students
- 959Brockville Collegiate InstituteBrockville · Public Secondary80% OSSLT pass rate · 425 students
- 1055Russell High SchoolRussell · Public Secondary87% OSSLT pass rate · 360 students
- 1151Glengarry District High SchoolAlexandria · Public Secondary86% OSSLT pass rate · 235 students
- 1244Thousand Islands Secondary SchoolBrockville · Public Secondary89% OSSLT pass rate · 640 students
- 1337Tagwi Secondary SchoolAvonmore · Public Secondary79% OSSLT pass rate · 495 students
- 1437Seaway District High SchoolIroquois · Public Secondary73% OSSLT pass rate · 265 students
- 1535South Grenville District High SchoolPrescott · Public Secondary81% OSSLT pass rate · 370 students
- 1631Perth and District Collegiate InstitutePerth · Public Secondary71% OSSLT pass rate · 580 students
- 1729Vankleek Hill Collegiate InstituteVankleek Hill · Public Secondary71% OSSLT pass rate · 370 students
- 1827Athens District High SchoolAthens · Public Secondary73% OSSLT pass rate · 160 students
- 1921Smiths Falls District Collegiate InstituteSmiths Falls · Public Secondary79% OSSLT pass rate · 700 students
- 208Cornwall Collegiate and Vocational SchoolCornwall · Public Secondary72% OSSLT pass rate · 575 students
- 215St Lawrence Secondary SchoolCornwall · Public Secondary53% OSSLT pass rate · 505 students
| # | School | Sector | Success Index (Canada) | Key result | Students |
|---|---|---|---|---|---|
| 1 | North Grenville District High School Kemptville · Secondary · Grades 9-12 | Public | 73.4 Top 25% | 83% OSSLT pass rate | 605 |
| 2 | Gananoque Secondary School Gananoque · Secondary · Grades 9-12 | Public | 68.0 Top 50% | 89% OSSLT pass rate | 335 |
| 3 | Charlottenburgh and Lancaster District High School Williamstown · Secondary · Grades 9-12 | Public | 67.3 Top 50% | 96% OSSLT pass rate | 200 |
| 4 | Almonte District High School Almonte · Secondary · Grades 9-12 | Public | 66.5 Top 50% | 90% OSSLT pass rate | 380 |
| 5 | Rideau District High School Elgin · Secondary · Grades 9-12 | Public | 64.5 Top 50% | 79% OSSLT pass rate | 295 |
| 6 | North Dundas District High School Chesterville · Secondary · Grades 9-12 | Public | 60.8 Top 50% | 91% OSSLT pass rate | 380 |
| 7 | Rockland District High School Rockland · Secondary · Grades 9-12 | Public | 60.1 Top 50% | 84% OSSLT pass rate | 340 |
| 8 | Carleton Place High School Carleton Place · Secondary · Grades 9-12 | Public | 59.3 Top 50% | 88% OSSLT pass rate | 670 |
| 9 | Brockville Collegiate Institute Brockville · Secondary · Grades 9-12 | Public | 58.7 Top 50% | 80% OSSLT pass rate | 425 |
| 10 | Russell High School Russell · Secondary · Grades 9-12 | Public | 55.0 Top 50% | 87% OSSLT pass rate | 360 |
| 11 | Glengarry District High School Alexandria · Secondary · Grades 9-12 | Public | 51.4 Top 50% | 86% OSSLT pass rate | 235 |
| 12 | Thousand Islands Secondary School Brockville · Secondary · Grades 9-12 | Public | 43.5 Lower 50% | 89% OSSLT pass rate | 640 |
| 13 | Tagwi Secondary School Avonmore · Secondary · Grades 9-12 | Public | 37.3 Lower 50% | 79% OSSLT pass rate | 495 |
| 14 | Seaway District High School Iroquois · Secondary · Grades 9-12 | Public | 36.5 Lower 50% | 73% OSSLT pass rate | 265 |
| 15 | South Grenville District High School Prescott · Secondary · Grades 9-12 | Public | 35.3 Lower 50% | 81% OSSLT pass rate | 370 |
| 16 | Perth and District Collegiate Institute Perth · Secondary · Grades 9-12 | Public | 31.3 Lower 50% | 71% OSSLT pass rate | 580 |
| 17 | Vankleek Hill Collegiate Institute Vankleek Hill · Secondary · Grades 9-12 | Public | 29.2 Lower 50% | 71% OSSLT pass rate | 370 |
| 18 | Athens District High School Athens · Secondary · Grades 9-12 | Public | 26.6 Lower 50% | 73% OSSLT pass rate | 160 |
| 19 | Smiths Falls District Collegiate Institute Smiths Falls · Secondary · Grades 9-12 | Public | 20.5 Lower 50% | 79% OSSLT pass rate | 700 |
| 20 | Cornwall Collegiate and Vocational School Cornwall · Secondary · Grades 9-12 | Public | 7.9 Lower 50% | 72% OSSLT pass rate | 575 |
| 21 | St Lawrence Secondary School Cornwall · Secondary · Grades 9-12 | Public | 5.1 Lower 50% | 53% OSSLT pass rate | 505 |
North Grenville District High School in Kemptville leads the 2025 list of secondary schools in Upper Canada DSB with a Success Index (Canada) of 73.4. Of the 21 schools shown, 21 are public.
For the full picture see the wider Ontario secondary schools rankings, every school on the Upper Canada DSB page, or the comparison tool to put a shortlist side by side.
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Frequently asked questions
What is the best secondary school in Upper Canada DSB?
North Grenville District High School in Kemptville, Ontario ranks first among secondary schools in Upper Canada DSB with a Success Index (Canada) of 73.4 out of 100 (Enrolment: 605).
How are secondary schools in Upper Canada DSB ranked?
Each school's Success Index (Canada) combines 8 factors: eqao grade 3 (reading, writing, maths) (20%), eqao grade 6 (reading, writing, maths) (25%), eqao grade 9 mathematics (25%), osslt first-attempt pass rate (20%), fsa literacy score (25%), fsa numeracy score (25%), community advantage (fewer low-income households) (10%), parent education (fewer parents without a credential) (10%). Each factor is a percentile against schools of the same type across Canada. Schools with fewer than 60 students are excluded from rankings.
Are these 2025 rankings official?
No. They are computed by Success Tutoring from official Canadian data (Ontario – School information and student demographics; BC Data Catalogue – Foundation Skills Assessment). Provinces publish different assessments, so scores are comparable within a province, not between provinces.