Property Tax in Boulder County, Colorado
In Boulder County, Colorado, the typical homeowner pays $3,821 a year in property taxes on a home worth a median of $713,900. The figures on this page are the Census Bureau's published medians (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023), shown exactly as released.
What the Boulder County numbers mean
A median is the middle household: half of owner-occupied households in Boulder County pay more than $3,821, and half pay less. Your own bill is set by your home's assessed value, the exemptions you qualify for, and the local taxing districts your property sits in — so individual bills vary widely around the median.
Dividing the median tax by the median home value gives a derived effective rate of 0.54% for Boulder County. It is an estimate built from two survey medians, not the county's official rate, but it is a fair way to compare the local tax burden with other counties where home values are very different.
The key figures for Boulder County
| Measure | Boulder County |
|---|---|
| Median real estate taxes paid per year | $3,821 |
| Median home value | $713,900 |
| Derived effective rate* | 0.54% |
| Equivalent monthly tax | $318 |
| Tax per $100,000 of value (derived) | $535 |
| Illustrative tax on a $400,000 home (derived rate) | $2,140 |
For context, the Colorado medians are $2,448 of tax on $502,200 of value, and the US medians are $2,969 on $303,400. *Derived figures are estimates from Census medians, not official rates.
Boulder County at a glance
- Median tax rank in Colorado: #3 of 64 counties
- Median home value rank in Colorado: #5 of 64
- Population rank in Colorado: #9 of 64 (328,317 residents)
- Population density rank: #5 of 64 (452 people per square mile)
- Land area rank in Colorado: #52 of 64 (726 sq mi, 0.7% of the combined county land area)
- Median tax as a monthly figure: $318; per $1,000 of home value: $0.54
How Boulder County compares
The median tax bill in Boulder County is about 56% higher than the state median ($2,448 for Colorado) and about 29% higher than the US median ($2,969 nationally). By median taxes paid, the county ranks #3 out of 64 Colorado counties with published Census data — 2 counties in the state have a higher median bill.
Comparisons cut both ways: a county can have a modest rate but high bills because homes are expensive, or a high rate but modest bills because homes are cheaper. Boulder County's derived rate of 0.54% sits below the derived US figure of 0.98%.
Some extra context for Boulder County: the median bill works out to about $318 a month, and the derived rate equals roughly $535 of tax per $100,000 of home value. The county is home to 328,317 people — the #9 most populous county in Colorado, spread over 726 square miles, a density of about 452 people per square mile. Its median home value, $713,900, ranks #5 among the state's 64 counties with data.
Nationally, Boulder County's median bill of $3,821 ranks #255 of 3133 counties with published data — inside the top 8% of counties by tax paid. The county accounts for about 5.7% of Colorado's population, its median home value is about 42% above the state median, and at the derived rate the median home would hand over roughly 5.35% of its value in tax across a decade. Within the state, the distance from Boulder County to the most expensive county, Pitkin County ($4,450), is $629 a year.
Counties nearest Boulder County in the Colorado ranking
| County | Median tax paid | Median home value | Derived rate* |
|---|---|---|---|
| Pitkin County, CO | $4,450 | $1,131,200 | 0.39% |
| Broomfield County, CO | $3,888 | $631,600 | 0.62% |
| Douglas County, CO | $3,707 | $674,000 | 0.55% |
| Eagle County, CO | $3,339 | $814,700 | 0.41% |
How the tax is worked out
The bill is built in stages. First the assessor puts a market value on the property. Exemptions — a homestead exemption above all — then reduce the taxable amount. Finally the combined local rate is applied. To see the scale: at the county's derived rate of 0.54%, each $100,000 of value corresponds to about $535 of tax a year, and a $400,000 home to roughly $2,140. Real bills use the official assessment and district rates, not this derived figure, so treat the example as a sense of scale only.
Checking your assessment in Boulder County
Most successful appeals are won on facts, not arguments. Start with the property record card held by the Boulder County assessor: wrong square footage, an extra room, or a missing homestead exemption are common and fixable. Next, line your assessed value up against recent sales of genuinely similar homes nearby. Many disputes end at an informal conversation with the assessor's office; if yours does not, file the formal appeal with the review board named on your notice before its deadline, evidence attached, and keep paying the bill in the meantime so penalties do not build up.
More Colorado counties
Frequently asked questions
What is the median property tax in Boulder County, Colorado?
The median real estate tax paid in Boulder County, Colorado is $3,821 per year, on a median home value of $713,900 (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023).
What is the effective property tax rate in Boulder County, Colorado?
On a derived basis, 0.54%: the county's median tax bill of $3,821 divided by its median home value of $713,900. Because it is calculated from two survey medians, read it as a comparison estimate rather than an official rate.
How does Boulder County compare with the rest of Colorado?
Boulder County ranks #3 of 64 Colorado counties with published data by median taxes paid. Its median bill of $3,821 is about 56% higher than the Colorado median of $2,448.
How are property taxes calculated in Boulder County, Colorado?
Three steps produce the bill: an assessment of market value by the local assessor, a reduction for exemptions you qualify for (a homestead exemption is the common one), and multiplication by the combined rates of the county, municipality, school district and any special districts covering the property. The median result in Boulder County is $3,821 of tax on a $713,900 median home value.
Can I appeal my property tax assessment in Boulder County, Colorado?
Yes — appeals are handled locally. Start with the Boulder County assessor's property record card for your home, correct any factual errors, and back your case with comparable recent sales. Formal appeals go to the review board named on your assessment notice and must be filed by its deadline, typically within 30 to 90 days.