How to appeal a Siskiyou County, CA property assessment
✓ Verified — Last verified October 25, 2026
Filing details published for Siskiyou County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
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Instructions based on your notice
Regular assessment appeals: July 2 through November 30. Supplemental assessment appeals: within 60 days after the supplemental assessment notice. Source
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Where to file
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Clerk of the Assessment Appeals Board, Clerk’s Office Source
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Official appeal page
Go to the county’s appeal page
www.siskiyoucounty.gov
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Official offices
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Craig S. Kay Source
Sources for these instructions
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Read the source quotations (13)
https://www.siskiyoucounty.gov/assessor-recorder/page/assessment-appeals
Supplemental Assessment: No later than 60 days after the date on which the assessee was notified by Supplemental Assessment Notice Regular Assessment: July 2 through November 30
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https://www.siskiyoucounty.gov/assessor-recorder/page/assessment-appeals
Appeals are filed with the Clerk of Assessment Appeals Board, Clerk's Office.
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https://www.boe.ca.gov/proptaxes/calendar.htm
November 1 Property owners First installment of real property taxes and all taxes on personal property on the secured roll are due and payable.
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https://www.boe.ca.gov/proptaxes/calendar.htm
December 10 Property owners First installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m. or close of business day, whichever is later.
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https://www.boe.ca.gov/proptaxes/calendar.htm
February 1 Property owners Second installment real property taxes due and payable.
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https://www.boe.ca.gov/proptaxes/calendar.htm
April 10 Property owners Second installment of taxes on the secured roll, if unpaid, is delinquent at 5:00 p.m., or close of business day, whichever is later.
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https://www.siskiyoucounty.gov/treasurer-taxcollector/page/tax-payment-due-dates
When delinquent dates fall on a Saturday, Sunday, or a legal holiday, the hour of delinquency is 5:00 P.M. on the Next Business Day.
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https://www.siskiyoucounty.gov/treasurer-taxcollector/page/penalties
If your first installment amount is unpaid after December 10, a 10% penalty is added to the first installment amount due. If your second installment amount is unpaid after April 10, a 10% penalty plus a $20.00 cost fee is added to the second installment amount due.
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https://www.siskiyoucounty.gov/treasurer-taxcollector/page/online-inquiry-and-payment
Jennifer Taylor, Treasurer-Tax Collector
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https://www.siskiyoucounty.gov/treasurer-taxcollector/page/online-inquiry-and-payment
530-842-8340
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https://www.siskiyoucounty.gov/assessor-recorder/page/assessment-appeals
Craig S. Kay, Assessor-Recorder
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Continue with your property
Common questions
Where do I file a Siskiyou County assessment appeal?
Clerk of the Assessment Appeals Board, Clerk’s Office
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