What is the average effective property tax rate in Colorado?

Colorado's statewide average effective property-tax rate is approximately 0.51% of a home's fair-market value, according to 2024 data from the Tax Foundation and the Lincoln Institute of Land Policy. That is one of the lowest effective rates in the United States — the national median sits around 1.0–1.1%. The 0.51% figure accounts for Colorado's fractional assessment system: residential properties are assessed at roughly 6.765% of market value, and mill levies are applied to that assessed portion, not the full value.

How is Colorado property tax calculated?

Colorado counties do NOT apply the mill levy directly to a home's market value. The county assessor first converts market value to assessed value using the residential assessment ratio (currently about 6.765%). The mill levy (expressed as dollars per $1,000 of assessed value) is then multiplied by assessed value to produce the tax bill. The "effective rate" this calculator uses — annual tax divided by market value — is the simplest way to compare across states and counties, and it already bakes in the assessment ratio.

Why do Colorado property taxes vary so much by county?

Each of Colorado's 64 counties sets its own mill levy, which combines levies from the county, city or town, school district, fire district, water district, and any special districts. Pueblo County's effective rate (~0.75%) is nearly double Douglas County's (~0.41%) because of differences in school-district levies, service-district charges, and the underlying property values used to distribute the load. Always check your county assessor's website or a Notice of Valuation for your specific parcel.

What is the Colorado Senior Homestead Exemption?

Qualifying Colorado seniors (aged 65 or older who have lived in their home for at least 10 consecutive years) may receive an exemption that excludes 50% of the first $200,000 of their home's value from property tax. This can reduce an annual bill by roughly $510 at the statewide average effective rate. Applications are filed with your county assessor; the state reimburses counties for the lost revenue. Some veterans and surviving spouses also qualify for similar exemptions.

Does Colorado have a property tax limit or cap?

Colorado operates under the Taxpayer's Bill of Rights (TABOR), which limits how much revenue local governments can retain without a voter-approved override. In practice, TABOR and the legacy of the Gallagher Amendment (repealed in 2020) kept Colorado's effective rates among the lowest in the nation for decades. Since Gallagher's repeal, assessed values can rise with market values, so annual bills may increase more quickly than they did in the past — something to monitor if you buy in a rapidly appreciating market.

Is this calculator accurate enough for my actual tax bill?

It is a reliable planning estimate but not a substitute for your official Notice of Valuation. The effective rates used are 2024 county-level estimates; your actual bill depends on the specific mill levies set by every taxing authority overlapping your parcel, your parcel's individual assessed value, any exemptions you have been granted, and whether your county is in an odd or even reassessment year. For the exact figure, contact your county assessor or use their online property-search tool.

Colorado Property Tax Calculator

A Colorado property tax calculator that converts your home’s fair-market value into an annual tax estimate and the equivalent monthly figure — the number you need when building a realistic housing budget or comparing the true cost of owning across different Colorado counties.

How Colorado property tax works

Colorado uses a two-step assessment process that makes its tax system less transparent than states where the rate is applied directly to market value.

Step 1 — Assessed value. The county assessor multiplies your home’s market value by the residential assessment ratio. For tax year 2024 that ratio is approximately 6.765% statewide (reduced from 7.15% in 2023 after Senate Bill 23-108). A $500,000 home therefore has an assessed value of roughly $33,825.

Step 2 — Mill levy. Each taxing authority (county, city, school district, fire district, water district, and special districts) sets a mill levy — dollars of tax per $1,000 of assessed value. These levies are added together and applied to your assessed value. A combined levy of 150 mills on $33,825 in assessed value equals an annual bill of about $5,074, which works out to an effective rate of 1.01% on the original $500,000 — but statewide the average is much lower because most Colorado counties run lighter levies.

The effective rate this calculator uses (annual tax ÷ market value) compresses both steps into a single, comparable number. Colorado’s statewide average effective rate is 0.51%, one of the lowest in the US.

Worked example

A home in Jefferson County (effective rate 0.50%) with a market value of $550,000:

Input	Value
Home market value	$550,000
Effective rate	0.50%
Annual property tax	$2,750
Monthly (÷ 12)	$229.17

Change to Arapahoe County (0.57%) and the same home produces a bill of $3,135/year ($261/month) — a $385 annual difference purely from crossing a county line.

County	Rate	Annual on $550k	Monthly
Douglas	0.41%	$2,255	$188
Jefferson	0.50%	$2,750	$229
El Paso	0.54%	$2,970	$248
Arapahoe	0.57%	$3,135	$261
Pueblo	0.75%	$4,125	$344

Mortgage lenders typically escrow property taxes alongside the principal, interest, and homeowner’s insurance payment — so this monthly figure feeds directly into your total housing cost.

County-rate variability

Colorado’s 64 counties each set independent mill levies based on local budget decisions. The main drivers of variation are:

School-district levies — the single largest component of most Colorado property-tax bills, ranging from under 40 mills to over 80 mills depending on the district’s assessed value base and bond obligations.
Special districts — metro districts, water districts, fire districts, and recreation districts each add their own levy. Front Range suburbs with dense metro-district infrastructure (common in Douglas, Adams, and Weld counties) can carry 30–50 additional mills.
Market appreciation — since the Gallagher Amendment was repealed in 2020, assessed values now move in line with market values during each two-year reassessment cycle, so bills in fast-growing markets can rise substantially even if mill levies stay flat.

Always confirm your estimate with your county assessor’s office or the Colorado Division of Property Taxation at tax.colorado.gov before making purchasing or budgeting decisions.