Longmont Property Tax
Access 2026 property tax rates, payment portals, and assessment tools for Longmont. Taxes are administered by Boulder County.
Local Rate
N/A
County Avg
0.56%
State Avg
0.00%
City vs. County Jurisdiction
While you live in Longmont, property taxes are officially administered by Boulder County. The county handles your assessment, billing, appeals, and exemptions.
Longmont Tax Calculator
Est. Annual Bill
Rate: % (Boulder County)
How Property Taxes Work in Longmont
Property taxes for Longmont residents are calculated on the ad valorem principle — your bill is proportional to the fair market value determined by the Boulder County Appraisal District.
Assessment Role
The county assessor determines the value of all real estate in Longmont every tax year.
Collection Role
Taxes are collected by the county tax office and distributed to city, school, and special-district funds.
Longmont Tax Components
Your annual bill is a combined total of levies from multiple local government entities:
Lowering Your Longmont Property Tax Bill
Claim Exemptions
Most homeowners qualify for a Homestead Exemption that significantly reduces the taxable value of your primary residence. Seniors and veterans may qualify for additional relief.
Protest Your Value
If the county assessment exceeds fair market value you can file an appeal with the Appraisal Review Board (ARB). Over 50% of appeals result in a reduction.
2026 Important Deadlines
Assessment Notices
April – May
Protest Deadline
May 15th*
Payment Due
January 31st
*Protest deadlines are generally May 15th or 30 days after your notice was mailed, whichever is later.
Longmont Property Tax FAQs
For 2026, property tax rates in Longmont vary by parcel. Refer to the Boulder County average rate of 0.56002241210254% as a baseline estimate.
Residents of Longmont pay property taxes to the Boulder County Tax Assessor — not a city office. Use the county's official payment portal.
Yes. File a Notice of Protest with the Boulder County Appraisal District within 30 days of receiving your valuation notice. See the county appeal guide for step-by-step instructions.
Boulder County Official
Property tax for Longmont is handled at the county level.
Nearby Cities
💡 Tax Tip
Check for Homestead or Senior exemptions on the Boulder County portal. These can reduce your taxable value by $25,000–$100,000+.