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

6.7%of market value

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

Deadline: June 1

Typical window: May - June

See all 50 state deadlines for 2026 →

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.

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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

→ View Guide

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: May 1st or June 15th?

Colorado filing deadlines and process

🏦 How to Appeal Property Taxes in Escrow in Colorado (2026)

Yes, you can appeal even if your lender pays your taxes

🔑 Inheriting Property in Colorado: What Happens to Property Taxes (2026)

Colorado reassessment rules, exemptions, and strategies for inherited property

👤 Colorado Senior Property Tax Benefits: Every Exemption, Freeze & Deferral (2026)

Age 65+ exemptions, freezes, and deferrals in Colorado

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 Homestead Exemption 2026: Save $450 Every Year (Most Homeowners Missing Out)

Colorado's homestead exemption can save you $450 annually. H

Best Property Tax Appeal Services in 2026: Pricing, Coverage, and What to Know

Pricing, coverage, and what to know

Ownwell Review 2026: Pricing, Results & Is the Fee Worth It?

Pricing, success rates, $50M funding, and cheaper alternatives

Understanding Your Property Assessment Notice: What Every Homeowner Should Know

What that notice means and what to do next

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?

In Colorado, you file a appeal with the County Board of Equalization. An informal review is available before filing a formal appeal. The process has 3 levels: County Assessor (Informal), County Board of Equalization, Board of Assessment Appeals / District Court.

What is the Colorado property tax appeal deadline?

The deadline to appeal your property tax in Colorado is June 1. The typical window is May - June.

What is Colorado's property tax assessment ratio?

Colorado assesses residential property at 6.7% of market value. Colorado assesses residential property at 6.70% of actual value (rate adjusted periodically by legislature; 6.7% for 2025-2026).

How much can I save by appealing in Colorado?

The median home in Colorado is worth $472,000. If your assessment is 10% too high, you may be overpaying approximately $241 per year.

What evidence do I need for a Colorado property tax appeal?

The strongest evidence for a Colorado property tax appeal includes comparable sales (recent sales of similar homes nearby), photos of property condition issues, and documentation of assessment errors. The County Board of Equalization typically reviews 3-5 comparable sales within the last 6-12 months.

What is the effective property tax rate in Colorado?

The effective property tax rate in Colorado is approximately 0.51%. The median annual property tax bill is $2,407 on a median home value of $472,000.

Can I file a Colorado property tax appeal online?

Yes, Colorado offers online filing for property tax appeals. Check with your county County Board of Equalization for the specific online portal and submission requirements.