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Longmont, Boulder County, Colorado Property Taxes

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Property Taxes in Longmont, Colorado

  • Median Longmont, Colorado effective property tax rate: 0.58%, significantly lower than the national median of 1.02%, and higher than the Colorado state median of 0.50%.

  • Median Longmont, Colorado home value: $561,000

  • Median annual Longmont, Colorado tax bill: $3,181, $781 higher than the national median property tax bill of $2,400.

How are property taxes in Boulder calculated?

Property taxes in Longmont, Colorado 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 Longmont's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Longmont, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Longmont, Boulder County, Colorado Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

0.58%

Estimate Property Tax Bill

$3,254

$3,019

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Longmont Property Tax Calculator Work?

Use this Longmont property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Longmont's median effective tax rate of 0.58% — based on actual property records in Boulder County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Longmont's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Longmont: rates range from $2,640.00 in 80501 to $4,189.00 in 80503, primarily due to differences in school district levies and local assessment districts. Longmont's median property tax bill is $3,181, which is $781 higher than the state median tax bill and below the national median property tax bill of $2,400.

If your estimate is higher than expected, Ownwell can appeal your Longmont assessment — you only pay if we save you money.

About Longmont Property Taxes

About Property Taxes in Longmont, Boulder, Colorado

Longmont’s median effective property tax rate of 0.58% is higher than the Colorado state median of 0.50% and lower than the national median of 1.02%. This rate reflects the Boulder County base levy combined with local school district levies and metro districts that vary by subdivision throughout the city.

Property tax rates are not uniform across Longmont. Homeowners in the 80503 ZIP code carry a median effective rate of 0.59%, while those in 80501 pay 0.57%. This spread — 0.02 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Boulder County. Understanding which part of Longmont you live in can make a meaningful difference to your annual tax bill.

Longmont homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the June 1, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across Longmont, Boulder County, Colorado

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare Longmont's effective property tax rate to other cities in Colorado and the median property tax rates in Colorado and the U.S.

Property Tax Rates Across Longmont, Boulder County, Colorado

Source: Ownwell

0.36%

0.54%

0.72%

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 Longmont Tax Rate

0.58%

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%

Median Effective Colorado Tax Rate

0.50%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Longmont, Boulder County, Colorado

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
805010.43%0.51%0.57%0.59%0.60%
805030.49%0.56%0.59%0.61%0.66%
805040.46%0.52%0.57%0.60%0.61%

Source: Ownwell

Property Tax Assessment Values Across Longmont, Boulder County, Colorado

When examining property taxes in Longmont, Colorado, 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 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 Longmont.

For example, the median home price in Longmont is $561,000, with tax bills ranging significantly across the county. 80503 has the highest median home price at $723,100.

Property Tax Assessment Values Across Longmont, Boulder County, Colorado

Source: Ownwell

$406,400

$931,350

$1,456,300

Median Longmont Market Value

$561,000

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 Longmont, Boulder County, Colorado

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
80501$307,300$407,700$470,900$551,700$677,120
80503$495,100$578,200$723,100$947,025$1,348,430
80504$381,400$449,500$586,200$721,800$962,100

Source: Ownwell

Property Tax Bills Across Longmont, Boulder County, Colorado

Property tax bills in Longmont are based on the assessed value of a home, not its market price alone. Local taxing authorities apply their rates to that assessed value to determine the bill, so factors like location and the value assigned to the property can significantly affect what homeowners owe. With a median home price of $561,000, many homeowners see bills that vary widely across the city.

In Longmont, the 25th percentile tax bill is $2,462, the 75th percentile is $4,299, and the 90th percentile reaches $6,022. That range shows how much property taxes can differ from one homeowner to another, even within the same area. The lowest median tax bill is $2,640 in 80501, while the highest is $4,189 in 80503.

Ownwell helps homeowners lower property tax bills by reviewing assessments and identifying opportunities to appeal overassessments or claim eligible exemptions, which can lead to meaningful savings.

Property Tax Bills Across Longmont, Boulder County, Colorado

Source: Ownwell

$1,506

$5,408

$9,309

Median Longmont Tax Bill

$3,181

Median Boulder County Tax Bill

$4,202

Median Colorado Tax Bill

$2,732

Median United States Tax Bill

$2,400

Property Tax Bills Across Longmont, Boulder County, Colorado

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
80501$1,675$2,178$2,640$3,187$3,984
80503$2,653$3,232$4,189$5,776$8,724
80504$1,906$2,420$3,292$4,221$5,676

Source: Ownwell

Don't miss the deadline to appeal!

Frequently Asked Property Tax Questions in Longmont, Colorado

How are property taxes calculated in Longmont, Colorado?
Property taxes in Longmont, Colorado are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.
How do I appeal my property taxes in Longmont, Colorado?
To appeal your property taxes in Longmont, Colorado, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.
What property tax exemptions are available in Longmont, Colorado?
Common property tax exemptions in Longmont, Colorado include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.
When are property taxes due in Longmont, Colorado?
Property tax deadlines in Longmont, Colorado vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.
How can Ownwell help reduce my property taxes in Longmont, Colorado?
Ownwell provides professional property tax appeal services in Longmont, Colorado. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.