September through December
Know when to file, which assessment to challenge, and where to find the official instructions for your county, city or village.
By Homespring · Last checked
Published dates come from a current official calendar. Annual-calendar dates follow a standing local rule. Estimates and expected dates still need confirmation. A later notice for another property does not reopen your own expired window. These are 2026 filing dates, even when the resulting tax bill or hearing falls in 2027.
Notice-specific
September 14, 21, 28; October 5, 13; November 2, 2026
Seattle, Eastside and other King County notice cohorts
These dates correspond to notices mailed July 16, July 23, July 30, August 6, August 13 and September 3. Match your property to its own notice. October 13 accounts for the October 12 county holiday.
Read the King County guideEstimated
Estimated November 2026
Remaining fall notices in Vancouver, Camas, Battle Ground and Clark County
The county's standing schedule puts most notices in June and the balance in September. November is a planning estimate for the September cohort. The exact 2026 mailed count and your property's deadline are not established by that schedule.
Read the Clark County guideEstimated
Estimated October to November 2026
Bellingham, Ferndale, Lynden and other Whatcom County properties
The county says 2026 notices have not yet mailed and confirms a fall appeal opportunity. This month range is an estimate, not a published deadline. The October 27, 2025 deadline on the county page belongs to the prior assessment year.
Read the Whatcom County guideEstimated
Estimated December 2026
Olympia, Lacey, Tumwater and other Thurston County properties
A 2026 closing date has not been confirmed. The estimate follows the prior cycle, when October 10, 2025 notices led to a December 9, 2025 deadline. Do not reuse December 9 as a confirmed 2026 date.
Published
September 24 to October 15, 2026 for the four listed townships; later dates pending
Assessor appeals in the south and west suburbs
Bremen, Lemont, Calumet and Worth have published dates. Proviso, Orland, Thornton, Rich and Bloom do not yet have dates on the September 4 Assessor calendar. Board of Review appeals use a separate calendar and representation rules.
Read the Cook County guide| Township | Last filing date |
|---|---|
| Bremen | September 24, 2026 |
| Lemont | September 29, 2026 |
| Calumet | October 2, 2026 |
| Worth | October 15, 2026 |
| Proviso | Not yet published as of September 5, 2026 |
| Orland | Not yet published as of September 5, 2026 |
| Thornton | Not yet published as of September 5, 2026 |
| Rich | Not yet published as of September 5, 2026 |
| Bloom | Not yet published as of September 5, 2026 |
Published
November 30, 2026
Regular annual assessment appeals, including Irvine, Anaheim and Santa Ana
The county publishes July 2 through November 30 for the 2026 annual filing period. Supplemental and escape assessments have their own notice-based deadlines.
Read the Orange County guideAnnual calendar
November 30, 2026
Regular annual assessment appeals across San Diego County
The county's annual Proposition 8 window runs July 2 through November 30. Match the appeal type to the notice before using this date.
Read the San Diego County guideAnnual calendar
December 31, 2026
Buffalo city assessments, separate from Erie County town calendars
The standing city calendar allows December 1 through December 31 grievances. The detailed instructions available at verification still describe December 2025. Confirm the new cycle's forms, receipt time and delivery instructions before filing.
Expected
Expected November 16, 2026
Yonkers city assessments in Westchester County
The annual grievance period ends November 15, which falls on Sunday in 2026. November 16 is expected under New York's weekend rule, pending a cycle-specific city notice. Aim to deliver by Friday, November 13. Informal review has a September 15 deadline; additional BAR information is due December 15.
Annual calendar
November 17, 2026, 8 p.m.
Village assessment only, separate from Nassau County ARC
The village requires physical receipt by 8 p.m. on the third Tuesday of November, which is November 17 in 2026. A timely postmark does not substitute for receipt.
Read the Village of Freeport guideAnnual calendar
November 17, 2026
Village assessment only, separate from the Town of Babylon process
The village's annual period ends on the third Tuesday of November. In 2026 that is November 17. Confirm the current form, office cutoff and delivery method with the village.
Read the Village of Lindenhurst guidePublished
December 31, 2026
Property Value Appeals Board petitions after fall tax statements
The county publishes December 31, 2026. Hand delivery is due by 5 p.m.; mailed petitions need a qualifying USPS postmark by that date. Filing begins the day after tax statements mail.
Read the Clackamas County guideCheck your address to explore available savings information and Homespring support. Coverage depends on your property and jurisdiction.
An address check does not file an appeal or extend a deadline. Confirm service availability before relying on Homespring to file.