Douglas County, Colorado · Castle Rock
Douglas County property tax appeal guide
Fast-growing county between Denver and Colorado Springs. Use the protest date printed on your Notice of Valuation. You appeal through the Douglas County Assessor; Colorado uses Real Property Notice of Valuation protest (county form) filed with the County Board of Equalization (CBOE).
Douglas 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 Douglas 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.
Douglas County property tax FAQ
What is the property tax appeal deadline in Douglas 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 Douglas 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 Douglas 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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