2026 Cook County Township Appeal Calendar [Updated March 2026]

Knowing the cook county appeal calendar 2026 filing schedule is critical for commercial property owners who want to appeal their assessment. Miss your township's window and you're locked out until the next cycle. This page tracks the 2026 filing schedule as the Cook County Assessor publishes it — bookmark it and check back for updates.

This page will be updated as the 2026 schedule is released. Bookmark it.

Current Status: March 2026

As of March 2026, the Cook County Assessor has not yet published the 2026 filing schedule for township appeals. All 2025 filing windows are now closed. The 2026 schedule will be released on a rolling basis as each township's reassessment is completed.

The City of Chicago triad (which includes all Chicago townships) is being reassessed in 2026. This means new assessed values will be published and appeal windows will open for Chicago properties during the summer and fall of 2026. For details on what the reassessment means for your property, see our 2026 reassessment guide.

Suburban townships that were reassessed in 2024 or 2025 will have annual appeal windows in 2026 as well, though the schedule has not been announced.

What to Expect for the 2026 Schedule

Based on historical patterns, here's what commercial property owners should expect:

Chicago triad townships (North, South, West, Lake, Lake View, Hyde Park, Jefferson, Rogers Park, and others) will have their reassessment values published in mid-2026. Appeal windows will likely open in the summer and remain open for approximately 30 days per township. These windows will be staggered — not all Chicago townships open simultaneously.

Suburban townships that are not part of the 2026 reassessment triad will still have annual appeal windows. These typically follow a schedule similar to the prior year, opening one township at a time throughout the spring, summer, and fall.

2025 Schedule as a Reference Guide

While the 2026 schedule has not been published, the 2025 filing deadlines provide a useful reference for the typical order and timing of township appeal windows. Here are the 2025 closing dates for suburban townships:

Norwood Park: May 5, 2025

Evanston: May 21, 2025

New Trier: June 5, 2025

Elk Grove: June 18, 2025

Maine: July 18, 2025

Northfield: July 31, 2025

Barrington: August 15, 2025

Leyden: September 2, 2025

Wheeling: September 30, 2025

Palatine: October 22, 2025

Schaumburg: November 17, 2025

Niles: December 5, 2025

Hanover: December 22, 2025

The 2026 schedule may differ — the Assessor adjusts timing based on reassessment workload and other factors — but the general order tends to remain consistent year over year.

How to Check if Your Township Is Open

The most reliable way to check your township's current filing status is the Cook County Assessor's website at cookcountyassessor.com. The homepage displays which townships are currently open for appeals. You can also call the Assessor's office at (312) 443-7550.

When a township opens, property owners receive an assessment notice by mail. This notice shows your new assessed value and includes the appeal filing deadline. However, mail delivery can be slow — don't rely solely on receiving the notice. Check the website proactively.

How to Get Notified

To make sure you don't miss your window, consider these options:

Sign up with TaxRival. We monitor township filing windows and notify property owners when their appeal window opens. We also flag properties where the new assessment appears to exceed market value.

Check the Assessor's website weekly starting in April 2026 for suburban townships and June 2026 for Chicago triad townships.

Work with a property tax professional who monitors deadlines as part of their service. Most reputable firms track the calendar closely and will reach out to existing clients before each deadline. For more on the appeal deadlines and filing process, see our detailed guide.

Don't Wait for the Schedule to Prepare

Even though the 2026 windows haven't opened yet, now is the time to prepare. Gather your current operating income and expense data (T-12 statements), review your most recent assessment notice and tax bill, identify comparable sales in your area from the past 12-18 months, and check for signs your property is over-assessed.

Being prepared before the window opens means you can file quickly and avoid the last-minute rush that can lead to incomplete evidence packages.

How TaxRival Can Help

TaxRival monitors the Cook County appeal calendar so you don't have to. We'll notify you when your township opens and provide a pre-built analysis showing whether your property is a strong appeal candidate. If it is, we handle the entire filing process — evidence preparation, SmartFile submission, and Board of Review escalation if needed — on contingency. No savings, no fee.