You Can Appeal New Trier Township Property Taxes in 2026 — Even Though It's Not a Reassessment Year

If you own property in New Trier Township — in Winnetka, Wilmette, Kenilworth, Glencoe, or the surrounding North Shore communities — you may have heard that appeals only happen when the county "reassesses" your area every three years. It's an understandable mix-up: reassessment years get the headlines and the mailed notices. But the right to appeal isn't tied to reassessment. In Cook County you can challenge your assessed value in any year, and for New Trier, the 2026 Assessor window ran May 7 to June 22; the next opens in 2027.

The 2026 Window

The Cook County Assessor opens each township for appeals on its own schedule each year. New Trier Township's 2026 window opened on May 7, 2026, and the filing deadline was June 22, 2026. Miss it with the Assessor and you still have a later shot at the Board of Review — but the Assessor stage is the first and usually easiest place to start.

Wait — Isn't New Trier Only Reassessed Every Three Years?

Yes, and that part is true. New Trier is part of the north suburban assessment group, which the Assessor revalues once every three years. The last reassessment was 2025; the next is 2028. Cook County runs on a three-section ("triad") cycle — the City of Chicago, the north suburbs, and the south/west suburbs — each reassessed in a different year so the whole county isn't revalued at once.

Here's the key distinction. Reassessment is when the Assessor sets a new value for your property. Appeal is your right to challenge whatever value is currently on the books. Those are two different things — and the second one is available to you every year, not just when the first one happens.

Why Bother Appealing in an Off Year?

Because the value you don't fix this year doesn't reset next year — it follows you to the next reassessment. A few reasons an off-year appeal is worth your time:

1. Your value carries forward. The 2025 figure generally stands for 2026, 2027, and 2028 unless it's successfully appealed. Correcting it now can lower three more bills, not just one.
2. Errors don't fix themselves. Wrong square footage, an incorrect number of units, a missing homeowner or senior exemption, or outdated characteristics can quietly inflate your value year after year.
3. The market moves. New comparable sales — especially weaker ones near you — can support a lower value even when your assessment hasn't changed.
4. Condition changes. Deferred maintenance, damage, or other issues that lower your property's value are worth raising whenever they apply.

Proof: Off-Year Appeals Are Real

This isn't a loophole — it's routine. In 2024, also a non-reassessment year for New Trier, more than 4,400 property owners filed an appeal with the Cook County Assessor, and hundreds of them won a reduction. People appeal in off years all the time, and a meaningful share succeed. The only thing standing between you and the same opportunity in 2026 is the June 22 deadline.

Two Levels of Appeal: Assessor First, Board of Review Second

New Trier Township moves through two separate appeal bodies each year. The Assessor is first; if you're not satisfied, the Board of Review opens its own window after it. In 2026 New Trier's ran August 3 to September 1.

How to File Next Time

1. Find your PIN and current assessed value on your assessment notice or the Cook County Assessor's website.
2. Gather support — recent comparable sales, photos of any condition issues, and a check that your characteristics and exemptions are correct.
3. The Assessor window for New Trier Township closed on June 22, 2026.
4. The Board of Review window for New Trier closed on September 1, 2026; the next windows open in 2027.

Not sure whether your number is out of line? Review the signs your property is overassessed, or confirm your window on our deadlines page.