How to Appeal Your Property Tax in Colorado
Colorado homeowners can appeal their property tax assessment if they believe it's too high. This guide covers the 2026 appeal deadline, required evidence, and step-by-step process.
2026 Appeal Deadline: June 1
Don't miss your window. Missing the deadline means waiting another full year.
How Colorado Assesses Property
Colorado assesses residential property at 6.7% of market value. This means if your home is worth $472,000, your assessed value would be $31,624.
Colorado assesses residential property at 6.70% of actual value (rate adjusted periodically by legislature; 6.7% for 2025-2026).
The Appeal Process
Appeals are heard by the County Board of Equalization. An informal review is available before filing a formal appeal.
County Assessor (Informal)
County Board of Equalization
Board of Assessment Appeals / District Court
Colorado Appeal Deadline
What Overassessment Costs Colorado Homeowners
The median home in Colorado is worth $472,000. If your assessment is just 10% too high, you may be overpaying:
~$241/year
Effective tax rate: 0.51% · Median value: $472,000
Check Your Colorado Assessment
Enter your address to see your estimated overassessment and Colorado filing deadline.
Colorado Counties
Adams County
Median: $425,000 · Rate: 0.60%
Deadline: May 1 through June 8, 2026
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Arapahoe County
Median: $387,300 · Rate: 0.70%
Deadline: July 15, 2026 for real property and July 20, 2026 for personal property
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Denver County
Median: $636,400 · Rate: 0.48%
Deadline: June 1
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Douglas County
Median: $338,700 · Rate: 0.76%
Deadline: June 8
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El Paso County
Median: $319,355 · Rate: 0.42%
Deadline: June 1
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Jefferson County
Median: $436,276 · Rate: 0.66%
Deadline: June 9
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Guides & Resources
- Senior Property Tax Exemptions by State: The Complete 2026 Guide
- Best Property Tax Appeal Services in 2026: Pricing, Coverage, and What to Know
- Property Tax Exemptions Guide: 8 Types That Could Save You Thousands (2026)
- Understanding Your Property Assessment Notice: What Every Homeowner Should Know
- How Much Does Ownwell Cost? Pricing Breakdown & Comparison (2026)
- How to Appeal Property Taxes as a Senior
- How to Appeal Property Taxes in Colorado: Complete 2026 Guide
Property Tax Appeal Resources
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2026 Appeal Deadlines
Every state's deadline, filing method, and what happens if you miss it.
Assessment Ratios by State
Every state's assessment percentage — from 4% to 100% — with worked examples.
9 Ways to Lower Your Property Taxes
From homestead exemptions to formal appeals — every method that works.
Savings Calculator
Check if you're overassessed — enter your assessed value to see potential savings.