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
Thornhill Secondary School
167 Dudley Ave, Thornhill, Ontario, L3T2E5 · York Region DSB
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.
Est. 1969
ProgramsRegular Track
- 78%
- EQAO composite
- 9-12
- Grades
- 940
- Students
- English
- Language
−9 pts vs Markham · −2 pts vs York Region DSB — higher than 0 of the 14 other Markham secondary schools with published results
Grade 9Math 68%
OSSLTLiteracy 88%
View all EQAO results (2024–2025)
Grade 9
Mathematics
68%
Markham secondary avg: 82%
OSSLT
Literacy
88%
Markham secondary avg: 93%
Informational — not a ranking.
Is an address zoned for this school?
Check any address against Thornhill Secondary School’s attendance boundary.
Homes in this Catchment
Homes zoned for Thornhill Secondary School, inside its attendance boundary.
9th most homes for sale of Markham's 14 ranked secondary catchments · median asking 5th-highest of 14 published · Full Markham catchment league
96 homes · median $1.2M · 42 days on market
The market inside this boundary
13 new in the last 7 days18 with a recorded price cut (19% of 96) · median cut $75K
| Type | For sale | Median asking | Median DOM |
|---|---|---|---|
| Detached | 42 | $2.0M | 47 days |
| Semi-detached | 4 | — | — |
| Townhouse | 10 | $947K | 23 days |
| Condo apartment | 43 | $600K | 38 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
11 new in the last 7 days
| Type | For rent | Median asking rent | Median DOM |
|---|---|---|---|
| Detached | 22 | $1,895 | 29 days |
| Semi-detached | 2 | — | — |
| Townhouse | 1 | — | — |
| Condo apartment | 14 | $2,450 | 14 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 42 homes for rent in this catchment
New homes appear inside this boundary most weeks.Get an email when one is listed
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
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.
Which school board runs Thornhill Secondary School?
Thornhill Secondary School is a York Region DSB school. Board policies — including boundary changes, program eligibility and registration — are set by York Region DSB, not by DistrictIQ.
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 42 homes for lease in Thornhill Secondary School's catchment, with a median asking price of $1.2M. 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.
More questions (8)
Are detached homes available in Thornhill Secondary School's catchment?
Yes. 42 of the currently listed homes inside the catchment are detached properties. The overall median asking price for the shown set is $1.2M.
How are catchment homes determined for Thornhill Secondary School?
These are active listings whose address falls inside Thornhill Secondary School's attendance boundary, based on the board's published catchment. See the interactive polygon on the Thornhill Secondary School catchment map. Boundaries and program eligibility (such as French Immersion) can change — always confirm current zoning directly with York Region DSB.
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
Which Markham communities does Thornhill Secondary School's catchment cover?
Homes in Thornhill Secondary School's catchment are concentrated in Thornhill, Grandview and Royal Orchard. Each community links to a dedicated page with neighbourhood-level market data.
How does Thornhill Secondary School compare to other Markham secondary schools?
On the 2024–2025 EQAO assessments, 78% of Thornhill Secondary School students met the provincial standard (composite) — higher than 0 of the 14 other Markham secondary schools with published results. EQAO is a benchmark of provincial-standard achievement, not a ranking of school quality; academic results are one factor among many.
How should I read the EQAO results for Thornhill Secondary School?
EQAO results show the percentage of students who met or exceeded the provincial standard on each assessment, shown alongside the Markham secondary average for context. They are provided for information only and are not a ranking of school quality — academic outcomes are just one of many factors families may wish to consider.
How can I compare Thornhill Secondary School to other schools in Markham?
Open the Compare tool to line up Thornhill Secondary School against up to three other schools — EQAO results, grades, board and catchment status side by side.
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.
Get new listings in Thornhill Secondary School's catchment
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.
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 2024–2025 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.