Colorado property tax appeal · $49 flat · keep 100%
How to appeal your Colorado property taxes
Colorado assessors mail a Notice of Valuation (NOV) by May 1. Homeowners protest to the assessor in early June (the date is on the notice). If the assessor denies the protest, you can appeal to the County Board of Equalization, and beyond that to the Board of Assessment Appeals, binding arbitration, or district court. Values are set in odd-numbered reassessment years.
Colorado appeal deadline
Protest to the assessor in early June (the date is printed on your Notice of Valuation).
County assessors mail Notices of Value by May 1. The protest deadline is in early June and the exact date is printed on your notice — recent law has shifted it for some counties, so always use the date on your NOV rather than assuming June 1.
The Colorado appeal process, step by step
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.
Colorado counties
County-specific filing notes for Colorado's largest markets. More counties added as we expand.
Denver County
Denver
Notice of Valuation mails by May 1; protest by the early-June date on your notice. No filing fee.
El Paso County
Colorado Springs
Colorado Springs metro. Protest to the assessor in early June using the date printed on your Notice of Valuation.
Arapahoe County
Littleton
South metro Denver. File your written protest by the early-June deadline on your NOV.
Jefferson County
Golden
West metro Denver. Protest to the assessor in early June; escalate to the CBOE if denied.
Douglas County
Castle Rock
Fast-growing county between Denver and Colorado Springs. Use the protest date printed on your Notice of Valuation.
Boulder County
Boulder
Protest to the assessor in early June. Boulder values run high, so comparable-sales evidence matters.
Colorado property tax appeal FAQ
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.
Is there a fee to protest property taxes in Colorado?
No. Protesting to the assessor and appealing to the County Board of Equalization are free.
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