Licensed Child Care Centre
Dream Tree Montessori
25 Elgin Street, Markham
0.1 km
Full day
Operator: Casa De Montessori Ltd.
Licence #60292·Child Care Centre
Public Secondary · Markham
Homes for Sale in the Thornhill Secondary School Boundary
167 Dudley Ave, Thornhill, Ontario, L3T2E5 · York Region DSB
There are currently 96 homes for sale and 45 rentals inside the Thornhill Secondary School attendance boundary. The median asking price for active homes is $1.4M and the median asking rent is $2,350/month. The median time on market for homes for sale is 40 days. Updated October 25, 2026.
Thornhill Secondary School is a York Region DSB Public secondary school in Markham, serving 9-12. Homes in its catchment sit in Thornhill, Grandview and Royal Orchard. Every home shown below falls inside the York Region DSB-published attendance boundary — the same boundary the school board uses for enrolment.
ProgramsRegular Track
- 80%
- EQAO composite
- 9-12
- Grades
- 940
- Students
- English
- Language
−8 pts vs Markham · 0 pts vs York Region DSB — higher than 1 of the 14 other Markham secondary schools with published results
In 2025–26, Grade 9 mathematics results were above the Ontario average; OSSLT literacy results were close to the Ontario average. Compared with the school's own results from 2022-23 to 2025-26, Grade 9 mathematics moved up and down without a clear direction; OSSLT literacy stayed within 5 points.
Source: EQAO 2025–26 results, published by EQAO as open data (earlier years from the Ministry of Education's school information files). Each figure is the share of students meeting the provincial standard; "above" or "below" means more than 3 percentage points from the Ontario figure for the same assessment. These describe a cohort of students, not any individual, and are not a ranking.
Grade 9Math 70%
OSSLTLiteracy 89%
View all EQAO results (2025–2026)
Grade 9
Mathematics
70%
Markham secondary avg: 81%
OSSLT
Literacy
89%
Markham secondary avg: 95%
Down 4 points, 2022–23 to 2024–25
Three-year change is published by the Ministry of Education: the difference in percentage points between the 2024–2025 and 2022–2023 assessments (the Ministry’s latest edition; the results above are the newer EQAO year). Each assessment is written by a different group of students. EQAO does not report a result where fewer than 10 students wrote.
Results year by year
Every published year for Thornhill Secondary School, oldest first. Each year is a different group of students.
Grade 9 Mathematics70%
OSSLT Literacy89%
| Assessment | 2017-18 | 2018-19 | 2019-20 — no provincial assessment | 2020-21 — no provincial assessment | 2021-22 | 2022-23 | 2023-24 | 2024-25 | 2025-26 |
|---|---|---|---|---|---|---|---|---|---|
| Grade 9 Mathematics | not comparable | not comparable | no assessment | no assessment | 78% | 70% | 78% | 68% | 70% |
| OSSLT Literacy | 91% | 89% | no assessment | no assessment | 80% | 92% | 91% | 88% | 89% |
Results are the percentage of students who met or exceeded the provincial standard — the latest year from EQAO’s open data, earlier years as published by the Ministry of Education. A dash means no result was published for that year: EQAO does not report a result where fewer than 10 students wrote. No provincial assessment ran in 2019-20 or 2020-21, so those years are blank for every school and are never joined across. Before 2021–22 the Ministry published separate Academic and Applied Grade 9 results, which are not comparable with the single assessment published since.
Informational — not a ranking.
Is an address zoned for this school?
Check any address against Thornhill Secondary School’s attendance boundary.
Homes currently for sale inside this school boundary
Every home below is for sale and sits inside Thornhill Secondary School's mapped attendance boundary as published by York Region DSB. Being inside a boundary does not guarantee admission or enrolment — boundaries are reviewed and can change, and placement is confirmed by the school board.
9th most homes for sale of Markham's 14 ranked secondary catchments · median asking 2nd-highest of 14 published · Full Markham catchment league
96 homes · median $1.4M · 40 days on market
Buying in the Thornhill Secondary School catchment?
Tell us your budget and must-haves — a local agent will send you homes for sale inside this boundary and help set up viewings. No obligation.
More affordable secondary boundaries in Markham
Other Markham attendance boundaries with a lower median asking price, and the homes for sale inside each.
- Markham District High School96 for sale · $1.3M median· lower median
- Bur Oak Secondary School61 for sale · $1.1M median· lower median
- St Brother André Catholic High School277 for sale · $1.1M median· lower median
- Middlefield Collegiate Institute46 for sale · $999K median· lower median
- Father Michael McGivney Catholic High School162 for sale · $998K median· lower median
The market inside this boundary
9 new in the last 7 days15 with a recorded price cut (16% of 96) · median cut $50K
| Type | For sale | Median asking | Median DOM |
|---|---|---|---|
| Detached | 44 | $1.9M | 40 days |
| Semi-detached | 2 | — | — |
| Townhouse | 4 | — | — |
| Condo apartment | 46 | $599K | 41 days |
Active MLS® listings zoned inside Thornhill Secondary School’s board-published regular-track boundary — matched per listing to the polygon, not by distance. Asking (list) prices, never sold prices; days on market count from each listing’s source date; “new” means listed within 7 days. A price cut is counted only when the reduction was observed while the listing was on DistrictIQ’s feed — a floor, not a census — and increases never count. Medians are blank below 5 listings. The board publishes these boundaries without stating a school year. DistrictIQ last downloaded it 2026-08-29. Listings refresh continuously.
See all 96 homes for sale in this catchment →
New homes appear inside this boundary most weeks.Get an email when one is listed
The rental market inside this boundary
10 new in the last 7 days
| Type | For rent | Median asking rent | Median DOM |
|---|---|---|---|
| Detached | 27 | $2,150 | 23 days |
| Semi-detached | 3 | — | — |
| Townhouse | 1 | — | — |
| Condo apartment | 14 | $2,425 | 29 days |
Active MLS® rental listings zoned inside Thornhill Secondary School’s board-published regular-track boundary — matched per listing to the polygon, not by distance. Asking (list) rents, never negotiated rents; days on market count from each listing’s source date; “new” means listed within 7 days. Medians are blank below 5 rentals. The board publishes these boundaries without stating a school year. DistrictIQ last downloaded it 2026-08-29. Listings refresh continuously.
All 45 homes for rent in this catchment
New homes appear inside this boundary most weeks.Get an email when one is listed
Development activity inside this school boundary
69 current development applications of any type, including commercial and industrial, inside the Thornhill Secondary School attendance boundary (92 on record, including historical and closed files). The municipality does not publish unit counts for these applications. 46 of them have municipal activity recorded in the last five years; the other 23 are still listed as open with older or no published activity.
- 3 Steele Valley RoadDevelopment application · Submitted
- 397 Royal Orchard Boulevard, 399 Royal Orchard Boulevard, 345 Royal Orchard BoulevardDevelopment application · Under review
- HONGMEI LIDevelopment application · Under review
Municipal planning applications whose site is inside the boundary, as published by Markham; matched 2026-09-25. “Current” means the municipal process is still open (however long ago it was filed), or an approved file with municipal activity in the last five years. A planning application is not a school-board decision and does not itself change an attendance boundary. All Markham development applications.
Communities in This Catchment
Location & Attendance Boundary
Thornhill Secondary School attendance boundary· Boundaries can change — confirm with York Region DSB.Open interactive map →
- Address
- 167 Dudley Ave, Thornhill, Ontario, L3T2E5
- Phone
- 905-889-5453
- Website
- thornhill.ss.yrdsb.ca
Property profiles in this catchment18 addresses
Address-level school zoning and neighbourhood data, available whether or not the home is listed.
- 32 blue spruce Lane
- 1 Clark Avenue W #701 · 701
- 61 Confederation Way #58 · 58
- 79 Grandview Avenue
- 1 Grandview Avenue #2006 · 2006
- 60 Inverlochy Boulevard #806 · 806
- 137 Joanna Crescent
- 51 Royal Orchard Boulevard
- 397 Royal Orchard Boulevard #1008 · 1008
- 399 Royal Orchard Boulevard #PH22 · PH22
- 117 Theodore Place
- 7 Townsgate Drive #304 · 304
- 7 Townsgate Drive #413 · 413
- 7171 Yonge Street #2415 · 2415
- 7167 Yonge Street #621 · 621
- 7608 Yonge Street #622 · 622
- 7608 Yonge Street #624 · 624
- 7300 Yonge Street #706 · 706
A sample of the addresses in this catchment with a property profile.
Licensed childcare nearby6 centres
Licensed centres closest to Thornhill Secondary School — CWELCC status shown when it's published by the local service system manager.
6 licensed childcare centres nearby
Source: Ontario Ministry of Education licensed childcare data · Open Government Licence – Ontario · Last updated May 31, 2026
Getting to school: transportation is arranged by Student Transportation Services of York Region
Walk-distance rule (York Region DSB): JK–Grade 3: more than 1.2 km; Grades 4–8: more than 1.6 km; Grades 9–12: more than 3.2 km, and only where the address is not served by public transit. Distances are measured by the consortium along walking routes, not in a straight line.
York Region DSB secondary students whose address is served by public transit (within 1.2 km of a stop, at most 3 transfers, 75 minutes or less) do not receive a school bus.
Since January 2026 cancellations are decided for two service areas: Georgina (north of and including Ravenshoe Road) and the rest of the region.
Check eligibility for an address (official Student Transportation Services of York Region tool) · Delays and cancellations · Eligibility policy
Routes, stops and times are assigned per student and change during the year; DistrictIQ does not publish them. Confirm transportation for Thornhill Secondary School with Student Transportation Services of York Region. Facts checked 2026-09-24.
Compare Nearby Schools
The closest secondary schools by distance.
6 schools nearby
View all schools →Common questions
What is the Thornhill Secondary School catchment?
The Thornhill Secondary School catchment — also called its attendance boundary — is the area of addresses zoned for Thornhill Secondary School by York Region DSB. DistrictIQ maps the board-published boundary so you can check any address and browse the homes for sale inside it.
How do I check whether an address is zoned for Thornhill Secondary School?
Enter the address in the boundary checker on this page — it tests the point against York Region DSB's published attendance boundary for Thornhill Secondary School and tells you whether the address is zoned for it. To check every school an address is zoned for at once, find your school by address. Always confirm current zoning with York Region DSB before you buy or rent.
What grades does Thornhill Secondary School serve?
Thornhill Secondary School serves 9-12 (secondary). It is part of York Region DSB.
Does Thornhill Secondary School offer French Immersion or other program tracks?
Thornhill Secondary School offers Regular Track. Program catchments can differ from the regular attendance boundary — confirm eligibility directly with York Region DSB.
How many homes are for sale in Thornhill Secondary School's catchment?
As of the latest listing sync there are 96 homes for sale and 45 homes for lease in Thornhill Secondary School's catchment, with a median asking price of $1.4M. These are homes zoned for Thornhill Secondary School, inside its attendance boundary — use the explorer above to switch between homes for sale and for lease.
Are homes available to rent in Thornhill Secondary School's catchment?
Yes — 45 homes are currently listed for rent inside Thornhill Secondary School's attendance boundary. Listings refresh continuously; every rental inside the boundary is on the school's rentals page.
Can school catchments change?
Yes. School boards periodically run boundary (accommodation) reviews and can redraw catchments as enrolment shifts or new schools open. DistrictIQ reflects York Region DSB's current published boundary, but always confirm zoning directly with the board before making a purchase decision. How Ontario attendance boundaries work
Does living in Thornhill Secondary School's catchment guarantee a spot?
Not automatically. Falling inside the attendance boundary is the basis for enrolment, but it is not an absolute guarantee — placement still depends on school capacity, program availability such as French Immersion, and board policy. Always confirm current school boundaries and registration directly with York Region DSB.
Alert me when a home is listed in this boundary
See what's for sale inside Thornhill Secondary School's attendance boundary — email only, no sales calls.
We'll email you a link to confirm — no account or password needed. Email only, unsubscribe any time.
Keep exploring
Keep researching around Thornhill Secondary School — homes, communities and the wider Markham market.
Sources & methodology for this page
- School name, board, grades, enrolment, address and contact
- Ontario Ministry of Education — public school contact information and school information files (Open Government Licence – Ontario) · DistrictIQ's copy last updated October 24, 2026The Ministry's records are the identity source; the school's own website is linked for anything that changes during the year.
- Attendance boundary
- York Region DSB — published attendance-boundary data · The board publishes these boundaries without stating a school year. DistrictIQ last downloaded it 2026-08-29.Boundaries are drawn from the board's own boundary service; placement is confirmed by the board, and being inside a boundary does not guarantee a seat.
- EQAO results
- Education Quality and Accountability Office — current year from EQAO's open data; earlier years as published by the Ministry of Education · 2025–26 assessment; history 2017-18 to 2025-26 where publishedPercent of students meeting the provincial standard, shown beside city, board and provincial figures for the same assessment. Not a ranking.
- Programs (Regular Track, French Immersion, Extended French and others)
- York Region DSB — program areas in the board's boundary dataOnly programs the board publishes a boundary or program area for; application-based programs are not inferred.
- Homes for sale and rentals inside the boundary
- MLS® listings via IDX from the school's regular-track boundary · Counts and medians as of October 25, 2026; listings refresh continuouslyActive listings and asking prices only. Sold and leased prices are not shown.
- Communities in this catchment
- Derived from the communities of active listings inside the boundaryA community appears when it has active listings inside the boundary; it is not a board designation.
- Licensed child care nearby
- Ontario Ministry of Education — licensed child care facilities (Open Government Licence – Ontario)Facilities near the school, not necessarily inside the boundary or operating in the school.
School & assessment data
EQAO results are provided for informational purposes only and should not be interpreted as a ranking of school quality. Academic outcomes are only one factor families may wish to consider. EQAO results shown reflect the 2025–2026 assessment.
School and assessment data is sourced from the Ontario Ministry of Education, the Education Quality and Accountability Office (EQAO), Ontario Open Data, and the applicable public and Catholic district school boards across the regions we cover (Southern Ontario).
School information — including school boundaries, eligibility, EQAO results, programs and enrolment — is provided for general informational purposes only and may be inaccurate or out of date. Boundaries, eligibility, programs and enrolment can change at any time. EQAO figures reflect past assessment results, are shown per test relative to the city-wide average, are not a ranking, and do not predict any student's outcome. Always confirm current school boundaries and eligibility directly with the applicable school board before relying on this information.
Where our data comes from · source, licence and refresh cadence for every dataset.
Listing data is provided by the Toronto Regional Real Estate Board (TRREB) and PropTx under the Internet Data Exchange (IDX) program. The information is deemed reliable but is not guaranteed accurate by TRREB, PropTx, CREA or DistrictIQ Inc., Brokerage, may not reflect the most current status, and is subject to errors, omissions, prior sale, change, or withdrawal without notice. Listings should be independently verified.