Jefferson County, Colorado · Golden
Jefferson County property tax appeal guide
West metro Denver. Protest to the assessor in early June; escalate to the CBOE if denied. You appeal through the Jefferson County Assessor; Colorado uses Real Property Notice of Valuation protest (county form) filed with the County Board of Equalization (CBOE).
The second step after the assessor's June determination: appeal the assessor's Notice of Determination to the CBOE by Sep 15. Jeffco runs its own petition process through its Board of Equalization; hearings conclude by Nov 1.
Source: Jefferson County, CO — Appealing Real Property Valuation (CBOE due date) · verified September 12, 2026Colorado lets you petition to correct an erroneous valuation for the two prior tax years, even though the protest deadline for those years is long gone. The deadline is the first working day of the January following the two-year mark, which for tax year 2024 is Monday, January 4, 2027 (Golden Aluminum Co. v. Weld County BOCC, 867 P.2d 190). On OVERVALUATION grounds it is barred only if you both filed a protest AND the assessor mailed you a notice of determination for that year; a protest alone does not bar it, and other grounds such as a clerical error are not barred at all. WE CANNOT SUPPLY THE EVIDENCE FOR THIS ONE. Colorado decides value from comparable SALES inside a fixed 18-month base period, and an abatement for tax year 2024 has to argue that year's level of value, not today's. Our Colorado comparables are current assessment values from a later cycle, so they do not support this petition. Read the window as a real deadline you may want to meet, not as something our report evidences.
Source: Colorado Division of Property Taxation — Assessors' Reference Library, Vol. 2 Ch. 5 (Abatement/Refund Process) · verified August 26, 2026Jefferson County appeal deadline
June 8 (the date is also printed on your Notice of Valuation).
County assessors mail Notices of Value by May 1. Real property protests must be postmarked or made in person no later than June 8 (§39-5-121(1)(a), C.R.S.); personal property runs a separate June 30 clock. The date is also printed on your notice, and a handful of counties run an alternate calendar, so use your NOV where the two disagree.
How to appeal in Jefferson County
1. Notice of Valuation (by May 1)
Your county assessor mails a Notice of Valuation by May 1 showing your new actual value. Colorado reassesses in odd-numbered years (the last was 2025); in even years values usually carry forward, but you can still protest.
2. Protest to the assessor (early June)
File a written protest with the assessor by the deadline printed on your NOV, typically the first week of June. Include 3-5 comparable sales from the state's defined data-gathering period. No filing fee.
3. Assessor's determination (Notice of Determination)
The assessor reviews your protest and mails a Notice of Determination, usually by late June. If you disagree, you may appeal to the County Board of Equalization (CBOE).
4. County Board of Equalization hearing
The CBOE hears appeals, generally in July. Present your comparable-sales evidence to a referee or the board. Confirm your hearing date with the county.
5. Further appeal (optional)
If the CBOE denies your appeal, you generally have 30 days to escalate to the Board of Assessment Appeals (BAA), binding arbitration, or district court.
Jefferson County property tax FAQ
What is the property tax appeal deadline in Jefferson County, Colorado?
June 8 (the date is also printed on your Notice of Valuation). County assessors mail Notices of Value by May 1. Real property protests must be postmarked or made in person no later than June 8 (§39-5-121(1)(a), C.R.S.); personal property runs a separate June 30 clock. The date is also printed on your notice, and a handful of counties run an alternate calendar, so use your NOV where the two disagree.
What form do I use to appeal in Jefferson County?
Colorado uses Real Property Notice of Valuation protest (county form), filed with the County Board of Equalization (CBOE). There is no filing fee to appeal.
When is the Colorado property tax protest deadline?
Early June, the exact date is printed on your Notice of Valuation, which assessors mail by May 1. Recent law has shifted the date for some counties, so rely on your notice rather than assuming June 1.
Other Colorado counties
Is your Jefferson County home over-assessed?
Free check, no signup. Review the available comparable-property evidence, then choose the $49 Property Assessment Audit. Your results determine whether you receive an appeal packet or a valuation report. If you appeal, complete your county's required forms and submit them yourself. One-time payment, no contingency fee, 30-day refund.
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