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 8
Don't miss your window. Missing the deadline means waiting another full year.
How Colorado Assesses Property
Colorado uses two residential assessment rates. For tax year 2025, 6.25% of actual value for local government levies and 7.05% for school district levies. For tax year 2026, 6.8% of actual value less the lesser of 10% of that value or $70,000 for local government levies, and 7.05% of actual value for school district levies. Slightly lower rates apply in a year when statewide value growth is above 5%. Your Notice of Valuation shows both assessed values.
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
Deadline: June 8
Real property protests must be postmarked or delivered to the county assessor by June 8 (C.R.S. 39-5-122). If you disagree with the assessor's Notice of Determination, you may petition the County Board of Equalization (CBOE) by July 15 (C.R.S. 39-8-106). CBOE decisions are issued by August 5 (C.R.S. 39-8-107).
Typical window: May 1 - July 15
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: $516,000 · Rate: 0.55%
Deadline: June 8, 2026
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Boulder County
Median: $713,900 · Rate: 0.54%
Deadline: June 8, 2026
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Denver County
Median: $636,400 · Rate: 0.48%
Deadline: June 8, 2026
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Douglas County
Median: $725,700 · Rate: 0.59%
Deadline: June 8, 2026
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Eagle County
Median: $728,400 · Rate: 0.40%
Deadline: June 8, 2026
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El Paso County
Median: $455,000 · Rate: 0.38%
Deadline: June 8, 2026 for initial assessor appeal; July 15, 2026 for County Board of Equalization
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Grand County
Median: $477,150 · Rate: 0.41%
Deadline: June 8, 2026
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Jefferson County
Median: $632,958 · Rate: 0.66%
Deadline: June 8, 2026
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Larimer County
Median: $513,000 · Rate: 0.56%
Deadline: June 8, 2026
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Pueblo County
Median: $227,050 · Rate: 0.50-0.53%
Deadline: June 8, 2026
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Weld County
Median: $412,200 · Rate: 0.48% to 0.54%
Deadline: June 8, 2026
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Key Terms for Colorado Homeowners
A program that lets an eligible homeowner, usually a senior or disabled homeowner, postpone paying property taxes. The deferred amount becomes an interest-bearing lien or protected debt, repaid when the home is sold, transferred, or the owner dies.
Colorado Guides & Resources
📋 How to Appeal Property Taxes in Colorado: Complete 2026 Guide
Complete guide with deadlines, forms, and step-by-step instructions
📋 How Much Can Property Taxes Increase in Colorado? 2026 Complete Guide
Colorado caps, limits, and protections
📅 Colorado Property Tax Appeal Deadline 2026: June 8, Statewide
Colorado filing deadlines and process
🏦 Colorado Only Reassesses in Odd Years. Your Escrow Account Never Gets an Off Year.
Colorado's assessment clock skips every even year, but your mortgage servicer's escrow clock never does, and an appeal still open when the intervening year arrives doesn't get a second look until the next reappraisal.
🔑 Will Colorado Reassess the House I Inherited? Why the Tax Bill Can Still Jump
The biennial cycle protects heirs from reassessment, but the senior homestead exemption does not survive the owner
👤 Colorado's 10-Year Continuous Occupancy Senior Homestead and SB24-111 Portability for Movers
Article X §3.5 senior homestead + SB24-111 portability + Amendment G veteran expansion
Senior Property Tax Exemptions by State: The Complete 2026 Guide
Age-based discounts in every state
Property Tax Exemptions Guide: 8 Types That Could Save You Thousands (2026)
8 types that could save you thousands
How to Appeal Property Taxes as a Senior
Age-specific strategies and exemptions
2026 Property Tax Increases: What Homeowners Need to Know
Why assessments are surging and how to respond
Colorado Senior Property Tax Exemption: 50% Off, But You Need 10 Years in the Home
Colorado exempts 50% of your home's value for seniors, but y
Property Tax Deferral: How It Works and Which States Offer It
A deferral postpones your bill as an interest-bearing loan, not a discount, and 2025-26 brought real changes in Colorado and California
Understanding Your Property Assessment Notice: What Every Homeowner Should Know
What that notice means and what to do next
Ownwell Review 2026: Fees, Complaints & Is It Worth It?
Regional fees, renewal terms, and full service versus filing yourself
What Happens If You Don't Pay Property Taxes?
Liens, penalties, and how to avoid them, all 50 states, plus why Georgia's redemption period has no fixed end date
Property Tax Appeal Resources
Best Appeal Services Compared
7 companies compared, pricing, coverage, and pros/cons for 2026.
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.
Flat Fee vs Contingency: Which Saves More?
$49 flat vs 25-50% of savings, see the break-even math at every savings level.
Frequently Asked Questions
How do I appeal my property tax in Colorado?
What is the Colorado property tax appeal deadline?
What is Colorado's property tax assessment ratio?
How much can I save by appealing in Colorado?
What evidence do I need for a Colorado property tax appeal?
What is the effective property tax rate in Colorado?
Can I file a Colorado property tax appeal online?
Ready to Appeal Your Colorado Property Tax?
Enter your address for a free overassessment analysis. If the numbers support a appeal, your complete evidence packet is $49.
Neighboring State Guides
10% assessment ratio · 0.62% effective rate
11.5% assessment ratio · 1.33% effective rate
100% assessment ratio · 1.61% effective rate
33.33% assessment ratio · 0.67% effective rate
11% assessment ratio · 0.87% effective rate
55% assessment ratio · 0.52% effective rate
9.5% assessment ratio · 0.56% effective rate