Boulder County, Colorado Property Taxes
Property Taxes in Boulder County, Colorado
Median Boulder County effective property tax rate: 0.57%, significantly lower than the national median of 1.02%.
Median Boulder County home value: $722,400
Median annual Boulder County tax bill: $4,202, higher than the national median property tax bill of $2,400.
How are property taxes in Boulder County calculated?
Property taxes in Boulder County are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding your county's property tax system, exemptions, and reduction opportunities can lead to significant savings. Whether you live in Boulder or another part of Boulder County, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Boulder County, Colorado Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
0.57%
Estimate Property Tax Bill
$4,118
$3,821
$774
Average Annual Tax Savings
How Does the Boulder County Property Tax Calculator Work?
Use this Boulder County property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Boulder County's median effective tax rate of 0.57% — drawn from real transactions across the county — to generate your estimate.
Enter your property's estimated assessed value — the value the assessor assigns to your property, typically lower than market value after exemptions. Our calculator uses the median effective rate (actual bills divided by market value), which accounts for typical exemptions and is more accurate than applying the statutory millage rate directly.
Note: your assessed value reflects any exemptions you currently have. Boulder County's median effective tax rate is lower than the Colorado state median tax rate of 0.50%, while the county's median property tax bill is $4,202. Rates vary across Boulder County — scroll down to explore city-level trends and find the rate specific to your area.
If your estimate is higher than expected, Ownwell can protest your Boulder County assessment. Customers in the area saved an average of $774 last year.
Property Tax Rates Across Boulder County, Colorado
What Are Effective Property Tax Rates Across Boulder County?
Local government entities set tax rates, which vary widely across Boulder County. Each year, the county estimates its budget for public services and divides that total by the assessed value of all taxable property within its jurisdiction.
Below, compare Boulder County's effective property tax rate to other counties in Colorado or the U.S. median of 1.02%.
Boulder County's median effective rate stands at 0.57%, which is lower than the national median of 1.02%. Within Boulder County, the highest rate is found in ERIE at 0.72%, while UNINCORPORATED has the lowest at 0.41%.
These variations reflect differences in local school district levies, metro districts assessments, and special district bonds — which compound the base county rate.
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Boulder County Tax Rate
0.57%
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Colorado Tax Rate
0.50%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Boulder County, Colorado
| City | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Allenspark | 0.24% | 0.33% | 0.36% | 0.39% | 0.42% |
| Black Hawk | 0.47% | 0.50% | 0.54% | 0.56% | 0.57% |
| Boulder | 0.46% | 0.51% | 0.56% | 0.59% | 0.61% |
| Broomfield | 0.50% | 0.55% | 0.57% | 0.60% | 0.62% |
| Eldorado Springs | 0.55% | 0.61% | 0.70% | 0.77% | 0.91% |
| Erie | 0.62% | 0.68% | 0.72% | 0.86% | 0.98% |
| Golden | 0.31% | 0.41% | 0.48% | 0.50% | 0.51% |
| Jamestown | 0.36% | 0.44% | 0.52% | 0.60% | 0.66% |
| Lafayette | 0.44% | 0.49% | 0.55% | 0.57% | 0.59% |
| Longmont | 0.46% | 0.53% | 0.58% | 0.60% | 0.62% |
| Louisville | 0.44% | 0.49% | 0.54% | 0.56% | 0.57% |
| Lyons | 0.37% | 0.53% | 0.68% | 0.77% | 0.80% |
| Nederland | 0.46% | 0.53% | 0.60% | 0.66% | 0.72% |
| Niwot | 0.52% | 0.56% | 0.61% | 0.64% | 0.65% |
| Superior | 0.54% | 0.60% | 0.65% | 0.66% | 0.71% |
| Unincorporated | 0.20% | 0.32% | 0.41% | 0.58% | 0.87% |
| Ward | 0.24% | 0.39% | 0.46% | 0.53% | 0.57% |
| Berthoud | N/A | N/A | N/A | N/A | N/A |
| Frederick | N/A | N/A | N/A | N/A | N/A |
| Hygiene | N/A | N/A | N/A | N/A | N/A |
| Pinecliffe | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
$774
Average Annual Tax Savings
Save on Your Property Taxes and More With Ownwell
Property Tax Assessment Values Across Boulder County, Colorado
When examining property taxes in Boulder County, understanding the distinction between "market value" and "assessed value" is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Boulder County property tax assessor estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices:
In Boulder County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of May.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Boulder County.
For example, the median tax bill in Boulder County is $4,202, with tax bills ranging significantly across the county. Broomfield has the highest median home price at $1,123,000.
Property Tax Assessment Values Across Boulder County, Colorado
Source: Ownwell
$406,400
$931,350
$1,456,300
Median Boulder County Market Value
$722,400
Median Colorado Market Value
$519,879
Median United States Market Value
$235,294
Property Tax Assessment Values Across Boulder County, Colorado
| City | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Allenspark | $122,888 | $285,650 | $406,400 | $583,532 | $787,980 |
| Black Hawk | $481,420 | $620,950 | $715,700 | $834,750 | $945,200 |
| Boulder | $326,600 | $586,800 | $970,100 | $1,430,200 | $2,086,800 |
| Broomfield | $778,460 | $943,800 | $1,123,000 | $1,572,500 | $1,953,540 |
| Eldorado Springs | $12,040 | $497,225 | $649,650 | $985,075 | $1,304,300 |
| Erie | $557,400 | $628,400 | $751,350 | $886,900 | $1,077,400 |
| Golden | $141,205 | $370,075 | $551,450 | $709,000 | $872,730 |
| Jamestown | $145,080 | $324,650 | $506,800 | $653,015 | $836,330 |
| Lafayette | $301,100 | $501,575 | $641,350 | $900,825 | $1,160,210 |
| Longmont | $378,200 | $448,900 | $561,000 | $730,700 | $992,400 |
| Louisville | $482,200 | $692,500 | $851,800 | $1,086,875 | $1,410,130 |
| Lyons | $283,396 | $482,250 | $700,250 | $953,375 | $1,127,670 |
| Nederland | $306,760 | $455,175 | $654,086 | $854,350 | $1,066,950 |
| Niwot | $376,500 | $682,200 | $1,093,500 | $1,578,200 | $2,494,540 |
| Superior | $478,280 | $719,100 | $870,000 | $1,083,800 | $1,274,640 |
| Unincorporated | $8,698 | $69,775 | $204,680 | $511,150 | $827,830 |
| Ward | $97,100 | $208,675 | $440,300 | $637,875 | $796,200 |
| Berthoud | N/A | N/A | N/A | N/A | N/A |
| Frederick | N/A | N/A | N/A | N/A | N/A |
| Hygiene | N/A | N/A | N/A | N/A | N/A |
| Pinecliffe | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
$774
Average Annual Tax Savings
Save on Your Property Taxes and More With Ownwell
Property Tax Bills Across Boulder County, Colorado
Boulder County property tax bills are based on the assessed value of a home and the local tax rate, not the market price alone. For homeowners, that means a higher assessed value can lead to a larger bill, even when the home has not changed. With a median home price of $722,400, many residents face substantial annual taxes, especially compared with the national median property tax bill of $2,400.
What affects the bill? The county’s assessment process, local taxing authorities, and any exemptions or appeals all play a role. In Boulder County, the 25th percentile tax bill is $2,711, the 75th percentile is $6,357, and the 90th percentile is $9,235. Bills can vary widely, from $860.00 in Unincorporated to $6,732.00 in Niwot.
Ownwell helps homeowners challenge inaccurate assessments and find savings through property tax appeals and exemptions. By reviewing your assessment for errors and identifying missed opportunities, Ownwell can help reduce your property tax bill and keep more money in your pocket.
Median Boulder County Tax Bill
$4,202
Median Colorado Tax Bill
$2,732
Median United States Tax Bill
$2,400
Property Tax Bills Across Boulder County, Colorado
| City | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Allenspark | $309 | $975 | $1,506 | $2,198 | $3,087 |
| Black Hawk | $2,828 | $3,255 | $3,664 | $4,464 | $5,023 |
| Boulder | $1,721 | $3,174 | $5,536 | $8,225 | $12,187 |
| Broomfield | $4,367 | $5,315 | $6,517 | $8,948 | $11,640 |
| Eldorado Springs | $1,654 | $3,753 | $5,009 | $6,940 | $9,051 |
| Erie | $3,799 | $4,446 | $5,335 | $7,812 | $9,359 |
| Golden | $444 | $1,537 | $2,551 | $3,445 | $4,328 |
| Jamestown | $588 | $1,570 | $2,690 | $3,637 | $4,629 |
| Lafayette | $1,678 | $2,622 | $3,575 | $5,275 | $6,927 |
| Longmont | $1,929 | $2,462 | $3,181 | $4,299 | $6,022 |
| Louisville | $2,277 | $3,503 | $4,516 | $5,933 | $7,883 |
| Lyons | $1,420 | $2,530 | $4,768 | $6,891 | $8,444 |
| Nederland | $1,717 | $2,644 | $3,884 | $5,261 | $6,663 |
| Niwot | $2,063 | $4,050 | $6,732 | $9,880 | $15,502 |
| Superior | $2,670 | $4,319 | $5,701 | $7,416 | $8,710 |
| Unincorporated | $76 | $147 | $860 | $2,328 | $4,543 |
| Ward | $278 | $828 | $1,968 | $3,239 | $4,173 |
| Berthoud | N/A | N/A | N/A | N/A | N/A |
| Frederick | N/A | N/A | N/A | N/A | N/A |
| Hygiene | N/A | N/A | N/A | N/A | N/A |
| Pinecliffe | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
$774
Average Annual Tax Savings
Save on Your Property Taxes and More With Ownwell
Want to lower your Boulder County property taxes?
How Can I Lower My Property Taxes in Boulder County?
Looking to reduce your Boulder County property taxes? Ownwell is the leading property tax appeal company serving Boulder County. We specialize in helping property owners in the Boulder area and beyond lower their tax bills by working directly with the Boulder County Assessor's Office.
Through our tax monitoring service, we collect all necessary information to maximize your tax reductions. We navigate the complexities of the Boulder County property tax appeal process and identify all available exemptions, so you don't have to.
Whether you are a homeowner, a real estate investor, or an asset manager, our local team at Ownwell has the expertise to assess your current property tax situation and find strategic opportunities for reducing your tax burden.
Property Tax Appeals in Colorado
In Boulder County, homeowners who believe their property tax assessment is too high can file a protest with the Tax Assessor. The appeal process begins when a homeowner reviews the assessed value of the property and compares it with recent market conditions, similar homes, and any factors that may affect value. If the assessment appears inaccurate, the homeowner can submit a formal appeal by the deadline.
The protest process is designed to give property owners a chance to challenge how their property was valued for tax purposes. Once the appeal is filed, the Tax Assessor reviews the evidence and may adjust the assessment if the homeowner provides strong support for a lower market value. If the assessment is changed, the property tax bill may be reduced. If the assessor does not agree, the homeowner can continue the appeal before the board that listens to the appeals.
That board reviews the case and considers the evidence from both sides. The possible outcomes include keeping the assessment the same, lowering it, or in some cases making other adjustments based on the facts presented. Because the process depends on documentation and timing, it helps to be organized and prepared before filing.
Ownwell can help homeowners navigate the appeal process from start to finish. Our team identifies whether a property may be overassessed, prepares the appeal, and helps gather the evidence needed to support a lower valuation. We also guide homeowners through the steps and deadlines so they do not miss their chance to protest. For Boulder County homeowners, that means having expert support when challenging a property tax assessment and pursuing a fair outcome.
Exemptions in Colorado
What property tax exemptions are available in Boulder County, Colorado?
Boulder County homeowners may qualify for several property tax exemption programs, with the most important being the primary residence exemption for an owner-occupied home. This exemption is designed for homeowners who use the property as their main home, and it can reduce the taxable value of that residence. Other exemptions may also be available for qualifying seniors, disabled veterans, surviving spouses, and homeowners with certain disability-related circumstances, depending on eligibility rules.
Who is eligible for these exemptions?
Eligibility depends on the exemption type. The primary residence exemption generally applies to homeowners who live in the home as their permanent residence. Senior and disability-related exemptions usually require the homeowner to meet age, disability, or service-connected criteria. Surviving spouse exemptions may apply when a homeowner has lost a spouse and meets the program requirements.
How do homeowners apply for exemptions?
Homeowners typically apply through the county assessor or the appropriate state property tax office by submitting an exemption application and any required supporting documents. Because deadlines and documentation matter, it is important to file accurately and on time.
How can Ownwell help?
Ownwell helps homeowners identify every exemption they may qualify for, including the primary residence exemption, and guides them through the application process so they do not miss out on savings.
Available Exemptions
Senior
Disabled
Veteran
Non-Profit
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | June 8 |
Links | |
|---|---|
| Boulder Tax Assessor | |
| Website | maps.boco.solutions |