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Cook County · Illinois

New Trier Township property tax appeals

A New Trier Township property tax appeal starts with the Cook County Assessor's Office, then the Cook County Board of Review. This season's deadline has not been announced yet. Our forecast for New Trier Township, Cook County Assessor's Office: Jun 5, 2027 – Aug 19, 2027 (not an official date).

Next deadline
Expected Jun 5, 2027 – Aug 19, 2027
Forecast, not an official date
New Trier Township · Cook County Assessor's Office
Source: 35 ILCS 200/12-55 - Illinois Property Tax Code (ILGA; Wayback capture 2026-01-09)Last checked

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Enter the address or parcel number from your notice. We compare the assessment with similar homes and show the numbers, whatever they are. You decide and file yourself.

Part of Cook CountyEvery appeal date in Cook County

Where to file first
Cook County Assessor's Office
Our coverage
Free check available
  • Independent guide — not affiliated with New Trier, Cook County or any government agency.
Last updated
October 1, 2026
Sources last checked
October 3, 2026
Status
Verified guide

How we verify facts

When and where do I file a New Trier Township property tax appeal?

Who hears a New Trier Township appeal?

The stages in order. We are not affiliated with any of these offices.

  1. Cook County Assessor's Office

    Filing: appeal

    Official site

  2. Cook County Board of Review

    Filing: complaint

    Official site

  3. Circuit Court of Cook County (tax objection)

    Filing: objection

  4. Illinois Property Tax Appeal Board

    Filing: appeal

    Official site

Which New Trier Township filing windows are coming up?

New Trier Township filing windows
ClosesAreaWho hears itStatus
Expected Jun 5, 2027 – Aug 19, 2027New Trier TownshipCook County Assessor's Office · Official source · Last checked Oct 3, 2026Forecast, not an official date
Expected Aug 11, 2027 – Sep 22, 2027New Trier TownshipCook County Board of Review · Official source · Last checked Oct 3, 2026Forecast, not an official date

When were past New Trier Township deadlines?

Past New Trier Township filing windows
Tax yearWindowOffice
2026Closed September 1, 2026New Trier · Cook County Board of Review
2026Closed June 22, 2026New Trier · Cook County Assessor's Office
2025Closed June 5, 2025New Trier · Cook County Assessor's Office
2022Closed August 19, 2022New Trier · Cook County Assessor's Office

When is the New Trier appeal deadline?

Cook County Assessor's Office: Expected around June 2027 (between June 5, 2027 and August 19, 2027), based on past deadlines for tax years 2022, 2025 and 2026 (predicted, not yet announced). Cook County Board of Review: Expected to close between August 11, 2027 and September 22, 2027 (predicted, not yet announced). We'll confirm these dates when the county posts them.

Deadline detailBoard of Review re-review
New Trier Township, tax year 2025: the Board of Review's decision date was Feb 9, 2026 and the re-review period closed Feb 11, 2026; the Assessor (CCAO) certification date was Apr 20, 2026.[1] (latest published: tax year 2025)
Deadline detailNotice mailed
New Trier Township (2025 reassessment): Reassessment Notices were mailed Apr 23, 2025; appeals were due Jun 5, 2025.[2] (latest published: tax year 2025)

Who can answer questions about my assessment?

Hours: New Trier Township Assessor's office hours: 9:00 A.M. to 5:00 P.M. Office: The New Trier Township Assessor's office is at 739 Elm St., Winnetka, IL 60093; phone (847) 446-8200.

ContactHours
New Trier Township Assessor's office hours: 9:00 A.M. to 5:00 P.M.[5]
ContactOffice
The New Trier Township Assessor's office is at 739 Elm St., Winnetka, IL 60093; phone (847) 446-8200.[5]

Upcoming appeal deadlines in every county we track

What do New Trier Township property taxes and assessments look like?

Figures from public records and the Census, each with its source. They describe the county's homes as a group, not the value of any one home.

How New Trier Township home assessments are spread

Assessed values of 18,095 homes in the property classes our free check covers (202, 203, 204, 205, 206 and 8 more), tax year 2025 values after the Board of Review. Half are between $71,936 and $166,000; the median is $112,633. The last bar holds everything above it.Source: Assessment records from the county's open data (tax year 2025 values after the Board of Review), retrieved Sep 25, 2026; our calculation.

New Trier Township compared with other townships

  1. North Chicago$135,400
  2. New Trier$112,633
  3. Lake View$89,642
  4. Barrington$77,000
  5. Northfield$75,929
  6. River Forest$69,000
  7. Evanston$61,000
  8. Lemont$47,001
  9. Rogers Park$46,001

Ranked 2 of 38; showing the 9 nearest in rank.

Median assessed value by township: highest North Chicago ($135,400), lowest Thornton ($12,000).

Median assessed value of homes in the property classes our free check covers (202, 203, 204, 205, 206 and 8 more) for each township with at least 50 such homes, tax year 2025 values after the Board of Review.Source: Assessment records from the county's open data (tax year 2025 values after the Board of Review), retrieved Sep 25, 2026; our calculation.

How much home assessments changed, by township

  1. Cicero+20.0%
  2. Palos+20.0%
  3. Elk Grove0.0%
  4. Evanston0.0%
  5. Lake View0.0%
  6. Maine0.0%
  7. New Trier0.0%
  8. Norwood Park0.0%
  9. Rogers Park0.0%

Ranked 12 of 14; showing the 9 nearest in rank.

Median change in assessed value from tax year 2025 values after the Board of Review to tax year 2026 Assessor-certified values: Berwyn +24.0%, Cicero +20.0%, Elk Grove 0.0%, Evanston 0.0%, Maine 0.0%, New Trier 0.0% and more.

Median change per home from tax year 2025 values after the Board of Review to tax year 2026 Assessor-certified values, for homes with a value at both stages. 14 townships have the newer values so far.Source: Assessment records from the county's open data (tax year 2025 values after the Board of Review), retrieved Sep 25, 2026; our calculation.

What happened to New Trier Township appeals in tax year 2025

  1. Assessor32% lowered of 11,383
  2. Board of Review55% lowered of 12,316

Assessor: 32% of 11,383 appeals lowered (median cut 6.4%); Board of Review: 55% of 12,316 appeals lowered (median cut 6.6%)

Share of appeals on homes in the property classes our free check covers (202, 203, 204, 205, 206 and 8 more) that were lowered, unchanged or raised, by stage.Source: public appeal results for tax year 2025 from the county's open data, retrieved Sep 25, 2026; our calculation. Past results, not a prediction for any home.

New Trier Township filing windows on a calendar

  1. New Trier TownshipExpected Jun 5, 2027 – Aug 19, 2027 · Cook County Assessor's Office · Forecast, not an official date
  2. New Trier TownshipExpected Aug 11, 2027 – Sep 22, 2027 · Cook County Board of Review · Forecast, not an official date

New Trier Township: Expected Jun 5, 2027 – Aug 19, 2027; New Trier Township: Expected Aug 11, 2027 – Sep 22, 2027

Each bar is a filing window from its opening day to its last day. Forecasts show the expected closing range and are not official dates.Source: the official calendars and rules cited in the sources list below.

How often is property reassessed in New Trier?

New Trier Township is reassessed every three years with the North Suburbs; its scheduled reassessment years are 2025, 2028 and 2031.

Reassessment cycle
New Trier Township is reassessed every three years with the North Suburbs; its scheduled reassessment years are 2025, 2028 and 2031.[3]

What do home values and property taxes look like in New Trier?

New Trier Township (2025 reassessment): total assessed value grew 39% at the Assessor's initial reassessment, before appeals (tax year 2025). New Trier Township (2025 reassessment): the Assessor's median estimated market value for single-family homes was $1,186,000 (median 2024 sale price $1,314,000) (tax year 2025).

Assessed value change
New Trier Township (2025 reassessment): total assessed value grew 39% at the Assessor's initial reassessment, before appeals.[4] (latest published: tax year 2025)
Median assessor estimate
New Trier Township (2025 reassessment): the Assessor's median estimated market value for single-family homes was $1,186,000 (median 2024 sale price $1,314,000).[2] (latest published: tax year 2025)
Median condo price
New Trier Township (2025 reassessment): condos had a median 2024 sale price of $367,000; the Assessor's median estimate was $373,000.[2] (latest published: tax year 2025)
Median sale price
New Trier Township (2025 reassessment): the median sale price of single-family homes in 2024 was $1,314,000; the Assessor's median market value estimate for the class was $1,186,000.[4] (latest published: tax year 2025)
Median small apartment price
New Trier Township (2025 reassessment): small apartment buildings had a median 2024 sale price of $645,000; the Assessor's median estimate was $936,000.[2] (latest published: tax year 2025)

Other places nearby

Illinois property tax appeals: all counties

Where do these facts come from?

  1. [1]Board of Review 2025 Re-Review/Decision Dates (PDF, Rev.6/9/2026) - Cook County Board of ReviewOfficial notice, form, calendar or rules · last checked Oct 1, 2026
  2. [2]New Trier Township: Residential Valuations - Cook County Assessor's OfficeOfficial guide or FAQ · last checked Oct 1, 2026
  3. [3]Township Triennial Reassessment Schedule (PDF) - Cook County Board of ReviewOfficial notice, form, calendar or rules · last checked Oct 1, 2026
  4. [4]Property Values for New Trier Township Released - Cook County Assessor's Office (press release, April 24, 2025)Official guide or FAQ · last checked Oct 1, 2026
  5. [5]Cook County Township Assessors - Cook County Assessor's OfficeOfficial guide or FAQ · last checked Oct 1, 2026
  6. [6]Assessment & Appeal Calendar (page last updated 9/22/26) - Cook County Assessor's OfficeOfficial notice, form, calendar or rules · last checked Sep 24, 2026
  7. [7]35 ILCS 200/12-55 - Illinois Property Tax Code (ILGA; Wayback capture 2026-01-09)Statute or regulation · last checked Sep 24, 2026
  8. [8]Cook County Board of Review Dates and Deadlines 2026 Session (PDF, created 2026-09-14)Official notice, form, calendar or rules · last checked Sep 24, 2026
  9. [9]Frequently Asked Questions - Cook County Board of ReviewOfficial guide or FAQ · last checked Sep 24, 2026
  10. [10]New Trier Township Property Values Released - Cook County Assessor's Office (press release, July 21, 2022)Official guide or FAQ · last checked Oct 1, 2026
  11. 11.County open data: cook assessmentsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  12. 12.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  13. 13.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  14. 14.County open data: cook parcelsRetrieved Sep 25, 2026; aggregated by us for the charts above.
  15. 15.County open data: appeal resultsAggregated by us for the appeal-results chart.
  16. 16.County open data: appeal resultsAggregated by us for the appeal-results chart.

Not affiliated with New Trier Township or any government agency. Not legal advice. Not an appraisal.

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