How to appeal a Stanislaus County, CA property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for Stanislaus County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
Notice-dependent instructions
The filing office lists July 2–November 30, 2026 for regular assessments. Supplemental and escape appeals are due within 60 days of postmark or the mailing date on the bill, whichever is later.
Official source. Verified .
Where to file
Clerk of the Board of Supervisors, 1010 10th Street, Suite 6700, Modesto, CA 95354.
Official source. Verified .
Official offices
Stanislaus County Assessor
Sources for these instructions
https://www.stancounty.com/board/aab/
Between July 2, 2026 to November 30, 2026
Verified October 24, 2026
https://www.stancounty.com/board/aab/
Between July 2, 2026 to November 30, 2026 No later than 60 days after postmark or the mailing date printed on the tax bill, whichever is later.
Verified October 24, 2026
https://www.stancounty.com/board/aab/
CLERK OF THE BOARD OF SUPERVISORS 1010 10th Street, Suite 6700 Modesto, CA 95354
Verified October 24, 2026
Continue with your property
Common questions
Where do I file a Stanislaus County assessment appeal?
Clerk of the Board of Supervisors, 1010 10th Street, Suite 6700, Modesto, CA 95354.
Updated , from cited verification dates. Individual sources may have earlier checks.