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Cook County appeal deadlines 2026, by township
Every Cook County township has its own appeal window with the Assessor, then a second one with the Board of Review. Dates for all 38 townships, checked against the county's calendars on October 2, 2026.
Open now with the Assessor
- Hyde Park TownshipAssessor · closes October 8, 2026 (3 days left)
- Leyden TownshipAssessor · closes October 14, 2026 (9 days left)
- Worth TownshipAssessor · closes October 15, 2026 (10 days left)
- Wheeling TownshipAssessor · closes October 22, 2026 (17 days left)
- Proviso TownshipAssessor · closes October 27, 2026 (22 days left)
- Lake TownshipAssessor · closes October 29, 2026 (24 days left)
- Palatine TownshipAssessor · closes November 4, 2026 (30 days left)
- Orland TownshipAssessor · closes November 6, 2026 (32 days left)
- Jefferson TownshipAssessor · closes November 12, 2026 (38 days left)
Not open yet
The Assessor has not published 2026 dates for: Bloom, Hanover, Niles, Rich, Schaumburg, Thornton, North Chicago, South Chicago. Their windows open when notices are mailed.
All 38 townships
| Township | Assessor | Board of Review |
|---|---|---|
| BarringtonNorth suburbs | closed Sep 23 | not announced yet |
| BerwynSouth/west suburbs · reassessed 2026 | closed Jul 6 | closed Sep 29 |
| BloomSouth/west suburbs · reassessed 2026 | not announced yet | not announced yet |
| BremenSouth/west suburbs · reassessed 2026 | closed Sep 24 | not announced yet |
| CalumetSouth/west suburbs · reassessed 2026 | closed Oct 2 | not announced yet |
| CiceroSouth/west suburbs · reassessed 2026 | closed Jul 31 | closed Sep 29 |
| Elk GroveNorth suburbs | closed Aug 4 | closed Sep 29 |
| EvanstonNorth suburbs | closed Jun 4 | closed Sep 1 |
| HanoverNorth suburbs | not announced yet | not announced yet |
| Hyde ParkChicago | open until Oct 8 | not announced yet |
| JeffersonChicago | open until Nov 12 | not announced yet |
| LakeChicago | open until Oct 29 | not announced yet |
| Lake ViewChicago | closed Jul 13 | closed Sep 29 |
| LemontSouth/west suburbs · reassessed 2026 | closed Sep 29 | not announced yet |
| LeydenNorth suburbs | open until Oct 14 | not announced yet |
| LyonsSouth/west suburbs · reassessed 2026 | closed Sep 3 | not announced yet |
| MaineNorth suburbs | closed Jul 21 | closed Sep 29 |
| New TrierNorth suburbs | closed Jun 22 | closed Sep 1 |
| NilesNorth suburbs | not announced yet | not announced yet |
| North ChicagoChicago | not announced yet | not announced yet |
| NorthfieldNorth suburbs | closed Sep 4 | not announced yet |
| Norwood ParkNorth suburbs | closed May 26 | closed Sep 1 |
| Oak ParkSouth/west suburbs · reassessed 2026 | closed Jun 18 | closed Sep 1 |
| OrlandSouth/west suburbs · reassessed 2026 | open until Nov 6 | not announced yet |
| PalatineNorth suburbs | open until Nov 4 | not announced yet |
| PalosSouth/west suburbs · reassessed 2026 | closed Jul 17 | closed Sep 29 |
| ProvisoSouth/west suburbs · reassessed 2026 | open until Oct 27 | not announced yet |
| RichSouth/west suburbs · reassessed 2026 | not announced yet | not announced yet |
| River ForestSouth/west suburbs · reassessed 2026 | closed Jun 2 | closed Sep 1 |
| RiversideSouth/west suburbs · reassessed 2026 | closed Jun 8 | closed Sep 1 |
| Rogers ParkChicago | closed Jun 1 | closed Sep 1 |
| SchaumburgNorth suburbs | not announced yet | not announced yet |
| South ChicagoChicago | not announced yet | not announced yet |
| StickneySouth/west suburbs · reassessed 2026 | closed Aug 12 | not announced yet |
| ThorntonSouth/west suburbs · reassessed 2026 | not announced yet | not announced yet |
| West ChicagoChicago | closed Aug 21 | not announced yet |
| WheelingNorth suburbs | open until Oct 22 | not announced yet |
| WorthSouth/west suburbs · reassessed 2026 | open until Oct 15 | not announced yet |
Board of Review dates are published so far for groups 1 and 2 only. "Not announced yet" means the county has not published the date. Sources: Assessor's calendar, Board of Review 2026 dates (PDF).
How the two windows work
In 2026 the Assessor reassesses the south and west suburbs. A township opens for appeals when the Assessor mails its notices, and the last file date is on the notice. The north suburbs and the City of Chicago are not reassessed this year, but each township still gets an appeal window.
After the Assessor's window, the Board of Review opens townships in groups. It is a separate agency, and its decision sets the final county value for the year. Assessor or Board of Review: which to use
Exemption complaints at the Board of Review had their own 2026 window (August 3, 2026 – September 1, 2026).
Questions
How do I find my township?
Your township is printed on your assessment notice. You can also use the Assessor's address search, or type your address into our free check, which shows your township and deadline.
Why are there two deadlines?
The Assessor's window comes first. The Board of Review, a separate agency, opens townships later in groups after the Assessor certifies them. You can appeal to either or both.
How long is the Board of Review window?
The Board of Review says all townships are opened a minimum of 30 days. Use the exact dates it publishes for your township.
Can I file after the deadline?
Treat the last file date as a hard deadline. If you miss the Assessor, the Board of Review window is the next chance for the same year.
Which areas are reassessed in 2026?
The south and west suburbs. The north suburbs and the City of Chicago are not reassessed this year, but their owners can still appeal.
Sources
- Cook County Assessor — assessment calendar and deadlines
- Board of Review — 2026 township open/close dates (PDF)
- Board of Review — dates and deadlines
- Board of Review — frequently asked questions
Dates last checked against the Assessor's calendar and the Board of Review's published dates on October 2, 2026. If anything here differs from the county's own pages, the county's pages win.