Cook County · North & Northwest suburbs
New Trier Township Property Tax Appeal — 2026 Deadlines & Filing Windows
Everything a New Trier homeowner needs to appeal an over-assessment this year: the current filing window, where you sit in the reassessment cycle, how over-assessed New Trier homes are, and a plain walkthrough to file your own appeal — free, keeping every dollar you save.
New Trier Township homeowners have until 22 June 2026 to appeal their 2026 assessment with the Cook County Assessor — New Trier was last reassessed in 2025 and is next up in 2028. By ChonkHub’s read of the public roll, about 16.7% of New Trier’s 18,428 assessable homes and condos are assessed above comparable local properties, a median of $8,501 a year in likely over-assessment. Historically, 24.4% of New Trier residential appeals to the Assessor have won a reduction, and the Board of Review is a free second chance after that.
When is the property tax appeal deadline in New Trier Township?
The 2026 deadline to appeal your assessment with the Cook County Assessor in New Trier Township is 22 June 2026. The window has closed for this cycle; it opened 7 May 2026. This is a hard date — the Assessor does not accept late filings — so confirm it against your Reassessment Notice.
| Township | Reassessment group | Window opens | Deadline | Status |
|---|---|---|---|---|
| New Trier Township | North & Northwest suburbs | 7 May 2026 | 22 June 2026 | Closed for 2026 |
Source: Cook County Assessor Assessment & Appeal Calendar, as of 25 June 2026. Confirm on cookcountyassessoril.gov →
Is New Trier Township being reassessed in 2026?
New Trier Township is in the Assessor’s North & Northwest suburbs reassessment group, which Cook County reassesses once every three years. Its most recent reassessment was 2025; the next is 2028. You can still appeal in 2026 even though it is not a reassessment year.
What towns are in New Trier Township?
New Trier Township covers Wilmette, Winnetka, Glencoe, Glenview, Kenilworth, Northfield in Cook County — Wilmette is the largest share, about 48% of its homes. Your township is determined by where the property sits, not your mailing address, and it sets your filing deadline: homeowners across these towns file on the same 2026 New Trier schedule.
How over-assessed are homes in New Trier Township?
By ChonkHub’s read of the public roll, about 16.7% of 18,428 assessable dwellings in New Trier Township are assessed materially higher than comparable local properties, a median of $8,501 a year in likely over-assessment. It is a population estimate — whether your specific home is over-assessed is a per-parcel question the address check answers directly.
Across Cook County, roughly 124,411 dwellings are strongly over-assessed. See the full over-assessment report and method →
What are the odds of a successful New Trier Township appeal?
In New Trier Township, about 24.4% of residential appeals to the Assessor have historically won a reduction — and the Board of Review, a separate second stage, reduces assessments again for many who get little from the Assessor.
New Trier Township — appeal outcomes at the Assessor
| Appeal type | Appeals | Reduced | Median cut |
|---|---|---|---|
| residential | 22,982 | 24.4% | 8.8% |
| condo/coop | 2,571 | 18.5% | 6.2% |
| commercial | 512 | 41.8% | 11.8% |
Countywide, the Assessor reduces about 25.0% of appeals and the Board of Review about 31.9%. Full outcome data by year →
How do I appeal my property taxes in New Trier Township?
You appeal in up to two free stages — first the Cook County Assessor, then, if needed, the Board of Review — filing as the property owner with comparable properties as your evidence. In New Trier Township, start before your 22 June 2026 Assessor deadline: confirm you are over-assessed, gather comparables, and file on the county’s free portal.
Read the full step-by-step guide → · Common questions →
Check your address — freeSee your own assessment math before you file. You keep 100%.