Every county. Every township. Every window.
Cook County and the collar counties, pulled straight from each county's Assessor and Board of Review. Pick your county, find your township, and check the window before it closes.
Cook townships accepting appeals today
All 38 townships
Browse every Cook township & window
7 open · 17 closed · 14 not yet posted
| Township | Triad | Reassessed | Assessor 2026 | Last file date | BOR group |
|---|---|---|---|---|---|
| Hyde Park | City of Chicago | 2024 | Open now | Oct 8, 2026 | — |
| Jefferson | City of Chicago | 2024 | Not posted yet | — | — |
| Lake | City of Chicago | 2024 | Not posted yet | — | — |
| Lakeview | City of Chicago | 2024 | Closed | Jul 13, 2026 | — |
| North Chicago | City of Chicago | 2024 | Not posted yet | — | — |
| Rogers Park | City of Chicago | 2024 | Closed | Jun 1, 2026 | — |
| South Chicago | City of Chicago | 2024 | Not posted yet | — | — |
| West Chicago | City of Chicago | 2024 | Closed | Aug 21, 2026 | — |
| Barrington | North/Northwest | 2025 | Open now | Sep 23, 2026 | — |
| Elk Grove | North/Northwest | 2025 | Closed | Aug 4, 2026 | — |
| Evanston | North/Northwest | 2025 | Closed | Jun 4, 2026 | — |
| Hanover | North/Northwest | 2025 | Not posted yet | — | — |
| Leyden | North/Northwest | 2025 | Open now | Oct 14, 2026 | — |
| Maine | North/Northwest | 2025 | Closed | Jul 21, 2026 | — |
| New Trier | North/Northwest | 2025 | Closed | Jun 22, 2026 | — |
| Niles | North/Northwest | 2025 | Not posted yet | — | — |
| Northfield | North/Northwest | 2025 | Closed | Sep 4, 2026 | — |
| Norwood Park | North/Northwest | 2025 | Closed | May 26, 2026 | — |
| Palatine | North/Northwest | 2025 | Not posted yet | — | — |
| Schaumburg | North/Northwest | 2025 | Not posted yet | — | — |
| Wheeling | North/Northwest | 2025 | Not posted yet | — | — |
| Berwyn | South/West | 2026 | Closed | Jul 6, 2026 | — |
| Bloom | South/West | 2026 | Not posted yet | — | — |
| Bremen | South/West | 2026 | Open now | Sep 24, 2026 | — |
| Calumet | South/West | 2026 | Open now | Oct 2, 2026 | — |
| Cicero | South/West | 2026 | Closed | Jul 31, 2026 | — |
| Lemont | South/West | 2026 | Open now | Sep 29, 2026 | — |
| Lyons | South/West | 2026 | Closed | Sep 3, 2026 | — |
| Oak Park | South/West | 2026 | Closed | Jun 18, 2026 | — |
| Orland | South/West | 2026 | Not posted yet | — | — |
| Palos | South/West | 2026 | Closed | Jul 17, 2026 | — |
| Proviso | South/West | 2026 | Not posted yet | — | — |
| Rich | South/West | 2026 | Not posted yet | — | — |
| River Forest | South/West | 2026 | Closed | Jun 2, 2026 | — |
| Riverside | South/West | 2026 | Closed | Jun 8, 2026 | — |
| Stickney | South/West | 2026 | Closed | Aug 12, 2026 | — |
| Thornton | South/West | 2026 | Not posted yet | — | — |
| Worth | South/West | 2026 | Open now | Oct 15, 2026 | — |
| No township matches that search. | |||||
Three windows, in order
Opens the day reassessment notices mail for your township and runs ~30 days to the last file date.
Opens after the Assessor closes your township, in batched groups (1–7), with its own filing + evidence deadlines.
If the Board result falls short, a PTAB petition is due within 30 days of the Board's decision.
CCAO calendar is tax year 2026; BOR posted session is 2026. A township can have a 2026 assessor window open while its 2026 BOR window is not posted yet.
Kane County assesses annually. File your appeal with the Kane County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Kane source ›
| Township | BOR filing deadline | Status |
|---|---|---|
| Dundee | Jul 9, 2026 | Closed |
| Saint Charles | Jul 20, 2026 | Closed |
| Blackberry | Jul 27, 2026 | Closed |
| Big Rock | Aug 17, 2026 | Closed |
| Geneva | Aug 17, 2026 | Closed |
| Sugar Grove | Aug 24, 2026 | Open now |
| Batavia | Aug 31, 2026 | Open now |
| Rutland | Sep 18, 2026 | Open now |
Lake County assesses annually. File your appeal with the Lake County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Lake source ›
| Township | Published | BOR filing deadline | Status |
|---|---|---|---|
| Benton | Jul 23, 2026 | Aug 24, 2026 | Open now |
| Ela | Jul 23, 2026 | Aug 24, 2026 | Open now |
| Warren | Aug 6, 2026 | Sep 8, 2026 | Open now |
| Waukegan | Aug 6, 2026 | Sep 8, 2026 | Open now |
| Grant | Aug 13, 2026 | Sep 14, 2026 | Open now |
| Wauconda | Aug 13, 2026 | Sep 14, 2026 | Open now |
| West Deerfield | Aug 13, 2026 | Sep 14, 2026 | Open now |
| Zion | Aug 13, 2026 | Sep 14, 2026 | Open now |
| Cuba | Aug 20, 2026 | Sep 21, 2026 | Open now |
| Libertyville | Aug 20, 2026 | Sep 21, 2026 | Open now |
Will County assesses annually. File your appeal with the Will County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Will source ›
| Township | Published | BOR filing deadline | Status |
|---|---|---|---|
| Channahon | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Custer | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Dupage | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Frankfort | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Homer | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Joliet | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Lockport | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Monee | Aug 12, 2026 | Sep 11, 2026 | Open now |
| New Lenox | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Plainfield | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Reed | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Troy | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Wesley | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Wheatland | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Wilmington | Aug 12, 2026 | Sep 11, 2026 | Open now |
| Crete | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Florence | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Green Garden | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Jackson | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Manhattan | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Peotone | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Washington | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Will | Aug 13, 2026 | Sep 12, 2026 | Open now |
| Wilton | Aug 13, 2026 | Sep 12, 2026 | Open now |
Kankakee County assesses annually. File your appeal with the Kankakee County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Kankakee source ›
| Township | Published | BOR filing deadline | Status |
|---|---|---|---|
| Aroma | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Bourbonnais | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Essex | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Ganeer | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Kankakee | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Limestone | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Manteno | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Momence | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Norton | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Otto | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Pembroke | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Pilot | Sep 11, 2025 | Oct 14, 2025 | Closed |
| Rockville | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Salina | Sep 11, 2025 | Oct 14, 2025 | Closed |
| St Anne | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Sumner | Sep 10, 2025 | Oct 14, 2025 | Closed |
| Yellowhead | Sep 10, 2025 | Oct 14, 2025 | Closed |
Rock Island County assesses annually. File your appeal with the Rock Island County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Rock Island source ›
| Township | BOR filing deadline | Status |
|---|---|---|
| All townships | Oct 28, 2025 | Closed |
Kendall County assesses annually. File your appeal with the Kendall County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Kendall source ›
| Township | BOR filing deadline | Status |
|---|---|---|
| All townships | Oct 20, 2025 | Closed |
DeKalb County assesses annually. File your appeal with the DeKalb County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official DeKalb source ›
| Township | BOR filing deadline | Status |
|---|---|---|
| All townships | Nov 3, 2025 | Closed |
LaSalle County assesses annually. File your appeal with the LaSalle County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official LaSalle source ›
| Township | BOR filing deadline | Status |
|---|---|---|
| All townships | Dec 1, 2025 | Closed |
Winnebago County assesses annually. File your appeal with the Winnebago County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Winnebago source ›
| Township | BOR filing deadline | Status |
|---|---|---|
| Cherry Valley | Aug 29, 2025 | Closed |
| Durand | Aug 29, 2025 | Closed |
| Laona | Aug 29, 2025 | Closed |
| Owen | Aug 29, 2025 | Closed |
| Rockford | Aug 29, 2025 | Closed |
| Burritt | Aug 30, 2025 | Closed |
| Harlem | Aug 30, 2025 | Closed |
| Harrison | Aug 30, 2025 | Closed |
| Pecatonica | Aug 30, 2025 | Closed |
| Rockton | Aug 30, 2025 | Closed |
| Roscoe | Aug 30, 2025 | Closed |
| Seward | Aug 30, 2025 | Closed |
| Shirland | Aug 30, 2025 | Closed |
| Winnebago | Aug 30, 2025 | Closed |
Champaign County assesses annually. File your appeal with the Champaign County Board of Review within ~30 days of your township's assessment publication; a PTAB petition is then due within 30 days of the Board's decision. Official Champaign source ›
| Township | BOR filing deadline | Status |
|---|---|---|
| All townships | Sep 10, 2025 | Closed |
These counties publish their windows too; we're wiring them in as their data becomes machine-readable. Use the official source in the meantime.
- McHenry: Deadlines page is reCAPTCHA-gated when posted and removed between cycles; manual capture per cycle. official source ›
- DuPage: No single per-township schedule page; deadline = 30 days after each township's publication (derive from assessment publications). official source ›
- Madison: no per-township deadline table found (page structure changed?) official source ›
- Peoria: no township publication PDFs parsed official source ›
- Boone: County posts the rule only (30 days after publication, or Sep 10) — no per-township schedule or date. official source ›
- St. Clair: County posts the rule only — no per-township schedule or posted date. official source ›
What to check first
- 01 Confirm the property's county, township, and current filing window.
- 02 Pull the parcel by address or PIN.
- 03 Review comparable sales, not just a Zestimate-style value.
- 04 Check assessment history for unusual jumps.
- 05 Review exemptions and property characteristics for record issues.
- 06 Decide whether the evidence is strong enough to justify filing.
Verify before filing
- Cook County Assessor — Assessment & Appeal Calendar ›
- Cook County Board of Review — Dates & Deadlines ›
- Cook County Board of Review — Official Rules ›
- Illinois Property Tax Appeal Board (PTAB) ›
- Kane County Assessment Office — Filing Deadlines ›
- Lake County Board of Review — Filing Deadlines & Decision Mailed Dates ›
- Will County Supervisor of Assessments — Publication Schedule ›
- Kankakee County SOA — Publication & Appeal Deadline Dates ›
- Rock Island County Board of Review ›
- Kendall County Assessments — Board of Review ›
- DeKalb County Assessment Office ›
- LaSalle County SOA — Assessment Publications ›
- Winnebago County SOA — Assessment Publication List ›
- Champaign County Assessment Office — Assessment Publications ›
See if the evidence is worth reviewing.
Censum checks public records, comparable sales, assessment history, and process fit so you can decide whether to prepare an appeal packet, before the window closes.