Cook County appeal deadlines
2026 Assessor windows, township by township. Open ones first.
Dates are copied from the Assessor's calendar and checked by hand only periodically. Confirm yours on cookcountyassessoril.gov before you rely on it.
| Township | Assessor window | Status |
|---|---|---|
| Proviso | September 14, 2026 to October 27, 2026 | Closes today |
| Lake | September 16, 2026 to October 29, 2026 | 2 days left |
| Palatine | September 22, 2026 to November 4, 2026 | 8 days left |
| Orland | September 24, 2026 to November 6, 2026 | 10 days left |
| Jefferson | September 29, 2026 to November 12, 2026 | 16 days left |
| Schaumburg | October 6, 2026 to November 19, 2026 | 23 days left |
| Thornton | October 8, 2026 to November 23, 2026 | 27 days left |
| North Chicago | October 9, 2026 to November 24, 2026 | 28 days left |
| Niles | October 20, 2026 to December 3, 2026 | 37 days left |
| Rich | October 21, 2026 to December 4, 2026 | 38 days left |
| Hanover | October 22, 2026 to December 7, 2026 | 41 days left |
| Bloom | Not posted | Dates unconfirmed |
| South Chicago | Not posted | Dates unconfirmed |
| Norwood Park | April 13, 2026 to May 26, 2026 | Closed |
| Rogers Park | April 17, 2026 to June 1, 2026 | Closed |
| River Forest | April 20, 2026 to June 2, 2026 | Closed |
| Evanston | April 22, 2026 to June 4, 2026 | Closed |
| Riverside | April 24, 2026 to June 8, 2026 | Closed |
| Oak Park | May 6, 2026 to June 18, 2026 | Closed |
| New Trier | May 7, 2026 to June 22, 2026 | Closed |
| Berwyn | May 20, 2026 to July 6, 2026 | Closed |
| Lake View | May 28, 2026 to July 13, 2026 | Closed |
| Palos | June 3, 2026 to July 17, 2026 | Closed |
| Maine | June 5, 2026 to July 21, 2026 | Closed |
| Cicero | June 17, 2026 to July 31, 2026 | Closed |
| Elk Grove | June 22, 2026 to August 4, 2026 | Closed |
| Stickney | June 29, 2026 to August 12, 2026 | Closed |
| West Chicago | July 10, 2026 to August 21, 2026 | Closed |
| Lyons | July 23, 2026 to September 3, 2026 | Closed |
| Northfield | July 24, 2026 to September 4, 2026 | Closed |
| Barrington | August 11, 2026 to September 23, 2026 | Closed |
| Bremen | August 12, 2026 to September 24, 2026 | Closed |
| Lemont | August 17, 2026 to September 29, 2026 | Closed |
| Calumet | August 20, 2026 to October 2, 2026 | Closed |
| Hyde Park | August 26, 2026 to October 8, 2026 | Closed |
| Leyden | August 31, 2026 to October 14, 2026 | Closed |
| Worth | September 1, 2026 to October 15, 2026 | Closed |
| Wheeling | September 9, 2026 to October 22, 2026 | Closed |