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Cook County Appeals & Deadlines September 5, 2026 5 min read

September 24-29 is the cycle's first collision week

September 24-29, 2026: Bremen and Lemont Assessor closes overlap Board Group 2's September 29 close. Eleven of seventeen reassessment townships still lack published Board windows.

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*Snapshot date: September 5, 2026. Re-verify against the Assessor's calendar and the Board's schedule before relying on any date.*

Between Thursday, September 24 and Tuesday, September 29, three windows close on top of each other. Bremen closes at the Assessor on the 24th. Lemont closes at the Assessor on the 29th. The Board of Review's Group 2 (Berwyn, Cicero, Elk Grove, Lakeview, Maine, Palos) closes the same day, with evidence due October 9.

In the last South and West reassessment, tax year 2023, Bremen produced 10,560 Board decisions and Lemont 3,618. Berwyn, Cicero, and Palos together produced 17,534. A firm working all five is filing at the Assessor and the Board in the same week, on evidence that has to be ready for both.

The rest of this page is every reassessment township's position as of this week, with its 2023 Board volume so the size of what is coming is visible.

Quick Answer

Between September 24 and 29, Bremen's Assessor close (24th), Lemont's Assessor close (29th), and Board Group 2's close (29th, evidence due October 9) stack on the same week. In 2023, Bremen had 10,560 Board decisions and Lemont 3,618; Berwyn, Cicero, and Palos together had 17,534. As of September 5, 2026, eleven of seventeen reassessment townships still had no Board window published. Re-verify both calendars before relying on any date.

Open at the Board now: Group 2, August 31 to September 29, evidence due October 9

  • **Berwyn:** region - South/West, reassessed 2026; Assessor window - Closed July 6; 2023 Board decisions - 4,292; attorney share - 66%.
  • **Cicero:** region - South/West, reassessed 2026; Assessor window - Closed July 31; 2023 Board decisions - 3,505; attorney share - 67%.
  • **Palos:** region - South/West, reassessed 2026; Assessor window - Closed July 17; 2023 Board decisions - 9,737; attorney share - 90%.
  • **Elk Grove:** region - North; Assessor window - Closed.
  • **Lakeview:** region - Chicago; Assessor window - Closed.
  • **Maine:** region - North; Assessor window - Closed.

Cicero is the least counsel-represented township in the cycle. In 2023, a third of its Board decisions were on pro se or non-attorney filings, and those filings won 63 percent of the time against 41 percent for attorney-filed files in the same township over 2023 through 2025. Read that as selection, not as advice: pro se owners bring the clean cases.

Closed at the Board: Group 1, August 3 to September 1, evidence was due September 11

  • **River Forest:** region - South/West, reassessed 2026; 2023 Board decisions - 2,794.
  • **Riverside:** region - South/West, reassessed 2026; 2023 Board decisions - 2,239.
  • **Oak Park:** region - South/West, reassessed 2026; 2023 Board decisions - 8,983.
  • **Norwood Park:** region - North.
  • **Rogers Park:** region - Chicago.
  • **Evanston:** region - North.
  • **New Trier:** region - North.

The clocks that matter now start on the decision letter: three days from its date for re-review (Rule 26), thirty days from its postmark for PTAB.

Closed at the Assessor, Board date not yet published

  • **Stickney:** Assessor closed - August 12; 2023 Board decisions - 3,131; 2023 attorney-filed residential - 1,502.
  • **Lyons:** Assessor closed - September 3; 2023 Board decisions - 17,850; 2023 attorney-filed residential - 11,843.
  • **West Chicago (Chicago):** Assessor closed - Closed.

Lyons is the largest book in the cycle by a wide margin. It closed at the Assessor two days ago, and the Board has not scheduled it. When it opens, Rule 12's cap of 45 hearings per attorney code per group will bind faster there than anywhere else in the county.

A note on West Chicago: the Assessor's calendar page lists it with an August 31 Board window, but the Board's own 2026 schedule lists six Group 2 townships and West Chicago is not among them. The Board's schedule controls.

Still open at the Assessor

  • **Barrington:** region - North; Assessor closes - September 23.
  • **Bremen:** region - South/West, reassessed 2026; Assessor closes - September 24; 2023 Board decisions - 10,560.
  • **Lemont:** region - South/West, reassessed 2026; Assessor closes - September 29; 2023 Board decisions - 3,618.
  • **Calumet:** region - South/West, reassessed 2026; Assessor closes - October 2; 2023 Board decisions - 1,112.
  • **Hyde Park:** region - Chicago; Assessor closes - October 8.
  • **Leyden:** region - North; Assessor closes - October 14.
  • **Worth:** region - South/West, reassessed 2026; Assessor closes - October 15; 2023 Board decisions - 13,924.

Northfield closed at the Assessor yesterday, September 4.

Reassessment townships with no dates published

  • **Proviso:** 2023 Board decisions - 14,831; 2023 attorney-filed residential - 8,215.
  • **Orland:** 2023 Board decisions - 14,378; 2023 attorney-filed residential - 11,216.
  • **Thornton:** 2023 Board decisions - 12,344; 2023 attorney-filed residential - 4,755.
  • **Rich:** 2023 Board decisions - 6,480; 2023 attorney-filed residential - 3,997.
  • **Bloom:** 2023 Board decisions - 5,546; 2023 attorney-filed residential - 2,559.

Five townships, 53,579 decisions in the last cycle, and neither the Assessor's last-file date nor the Board's window is published for any of them. With Lyons, Stickney, Worth, Bremen, Lemont, and Calumet, that is eleven of seventeen reassessment townships whose Board windows are still to come, and they will land while Groups 1 and 2 are being decided.

The four questions, weekly

Is it open at the Assessor? Is it open at the Board? Has the evidence date passed? Have decisions issued? This page answers the first two for the week of September 5. The other two live in the firm's docket.

The numbers behind this article

Dates are from the Assessor's Assessment and Appeal Calendar and the Board of Review's "Dates and Deadlines 2026 Session" schedule, both read September 5, 2026. Decision counts are Censum's tabulation of the Board's Appeal Decision History dataset (county open data, 7pny-nedm), copy dated May 20, 2026; PIN-level decisions. Censum is independent and not affiliated with any county office. Censum tracks both calendars by township and PIN and flags the collisions; the county's published calendar controls over any snapshot, including this one.

Sources

FAQ

Which townships are in Board Group 2 through September 29?

Berwyn, Cicero, Elk Grove, Lakeview, Maine, and Palos. Evidence is due October 9.

Is West Chicago in Board Group 2?

The Assessor's calendar page has listed an August 31 Board window for West Chicago, but the Board's own 2026 schedule lists six Group 2 townships and West Chicago is not among them. The Board's schedule controls.

How large was Lyons in the last South and West cycle?

17,850 Board decisions in 2023, including 11,843 attorney-filed residential. It closed at the Assessor September 3, 2026; the Board had not scheduled it as of the September 5 snapshot.

Does Censum file or represent clients?

No. Censum LLC is independent property-tax intelligence and docket tooling. It is not a law firm. The attorney files and makes every legal judgment.

Next step

Look up every PIN still open at either office, mark Assessor close / Board close / evidence date / decision-issued, and staff the September 24-29 collision before it arrives. The county's live calendar controls over this snapshot.

Censum LLC is independent and not affiliated with Cook County or any government agency.