Assessment Notices by State: A Month-by-Month National Calendar

Updated August 10, 2026. Property-assessment calendars do not follow one national schedule. The useful question is not “What is the national deadline?” but “Which timing model controls this property, and what does the current official notice say?”

This month-by-month guide helps homeowners recognize the major notice and review patterns used across the country. It is an educational planning tool, not a substitute for the current notice, parcel record, or instructions from the responsible assessor, clerk, board, or appeal body.

The four timing models to recognize

1. A recurring statewide date plus a notice-relative extension

Texas is a familiar example. The Texas Comptroller says residence-homestead notices of appraised value are generally sent by April 1, other notices by May 1, or as soon as practical afterward. The usual protest deadline is May 15 or 30 days after the appraisal district mails the notice, whichever is later. The date on the current notice and the district’s official record still control the property-specific calculation.

2. A fixed filing window that varies by county

California’s regular-roll appeal window opens July 2. The State Board of Equalization explains that it generally closes September 15 when the assessor provided the required notices by August 1, and November 30 otherwise. Supplemental and escape assessments use separate notice-relative rules, so the regular window should not be applied to every assessment type.

3. A deadline measured from the notice

Florida’s Department of Revenue says TRIM notices are mailed in August and value-adjustment-board petitions concerning value are generally due within 25 days of the notice. King County, Washington, uses a different notice-relative structure: the regular petition is due by July 1 of the assessment year or within 60 days after the value notice, whichever is later. These examples show why the notice date is a material fact, not a reminder preference.

4. A municipality- or township-specific calendar

Wisconsin requires each municipality to hold Open Book and Board of Review sessions, and the Department of Revenue publishes a property-owner lookup with municipal dates plus clerk and assessor contacts. Cook County, Illinois, publishes separate reassessment and appeal dates by township. A county name or postal city alone may not identify the responsible calendar.

A practical month-by-month calendar

January and February: establish the record

• Keep the prior notice, final decision, tax bill, exemption record, and any parcel-characteristic corrections together.
• Confirm the property’s parcel or account identifier and the authority that actually assesses it.
• Start dated condition documentation while facts are observable; distinguish homeowner-supplied evidence from official public records.

These steps do not mean a filing window is open. They make later notice review less dependent on memory or a hurried search.

March and April: watch for early notices and local calendars

Some jurisdictions begin mailing residential notices in early spring. Texas residence-homestead notices are a prominent example, and Cook County township notices can begin in late April during the relevant reassessment cycle. When a notice arrives, record the mailing date, assessment year, value stage, parcel identity, and the official source used to verify each one.

May and June: local schedules matter

Texas’s usual filing period is active in this part of the year, but later-mailed notices can produce later property-specific dates. Wisconsin Open Book and Board of Review sessions generally occur from late May into mid-June, although the DOR notes that some occur later. Cook County’s township sequence also continues on different dates. Do not copy a neighboring municipality’s or township’s calendar.

July and August: regular-roll and summer notice season

California’s regular-roll window opens July 2. Florida property appraisers mail TRIM notices in August. King County valuation notices can arrive across a broad May-to-November mailing period, making the notice date essential to the parcel deadline. This is a high-value time to compare the notice with the current official parcel record and identify discrepancies in property characteristics, value stage, or exemptions.

September through November: later windows and notice-relative dates

California counties use the applicable September 15 or November 30 regular-roll closing date. Florida’s petition date follows the TRIM mailing rather than a single national September date. King County’s later-of rule continues to depend on the parcel notice. Local boards may also publish hearing-evidence deadlines that are separate from the initial petition deadline.

December: preserve the audit trail

Keep filing confirmations, the submitted packet, hearing notices, evidence-delivery receipts, and the decision with the assessment year they belong to. If no current window is open, continue gathering factual records for the next cycle and recheck the responsible authority’s official calendar when it is published.

What to capture when an assessment notice arrives

1. Property identity: parcel or account number, situs address, and assessing authority.
2. Notice identity: assessment year, notice type, value stage, mailing date, and any printed filing date.
3. Value fields: land, improvement, total assessed or appraised value, and any distinct taxable or statutory value.
4. Record facts: square footage, property class, year built, exemptions, and other characteristics shown by the official record.
5. Source context: official URL, retrieval date, and any uncertainty or conflict that still needs verification.

If the notice and online record conflict, preserve both. Do not silently choose the number that appears more favorable. A responsible packet should identify the conflict and the next official verification step.

Official sources used for this guide

• Texas Comptroller: appraisal protests and appeals
• California State Board of Equalization: assessment appeals
• Florida Department of Revenue: taxpayer calendar
• Wisconsin DOR: Open Book and Board of Review calendar
• King County: how to appeal a valuation
• Cook County Assessor: township assessment and appeal calendar

FairPath provides document-preparation software for homeowners representing themselves. It does not file, negotiate, appear, or communicate with an assessment authority for the homeowner, and it does not predict an assessment reduction, tax savings, acceptance, or hearing result. Always verify the current notice and official local instructions before filing.