AppealDesk

Jefferson County Property Tax Appeal, Colorado

Travis BunnTravis Bunn·Updated July 22, 2026

Watch: How to appeal your property taxes in Jefferson County

Jefferson County, located along Colorado's Rocky Mountain Front Range west of Denver, is the fourth-most populous county in Colorado with an estimated population of 580,543 as of 2026. The county seat is Golden, which served as Colorado's capital twice, and major population centers include Lakewood (the county's most populous city), Arvada, Westminster, and Wheat Ridge. The median home value in Jefferson County is $632,958, substantially higher than both the Colorado state median of $472,000 and the national median. With an effective property tax rate of 0.66%, the median annual property tax bill of $2,797 is $397 above the national median of $2,400, making property tax appeals particularly valuable for homeowners seeking to ensure fair assessments in this high-value real estate market.

Notable cities: Golden, Lakewood, Arvada, Westminster, Wheat Ridge

Median Home

$632,958

Tax Rate

0.66%

Annual Tax

$2,797

Population

580,543

On the typical Jefferson County home, valued near $632,958 at the county’s effective tax rate of 0.66%, an over-assessment of even 10% means you are overpaying year after year until you appeal it. Here is how to find out if yours qualifies.

2026 Appeal Deadline: June 8, 2026

This year's appeal window has passed in most of Colorado. Order now and we re-run your numbers free when the window reopens, so your evidence is ready the day your next notice lands.

Property owners may file an appeal beginning May 1 through June 8 each year. Any mailed appeal must be postmarked no later than June 8. If dissatisfied with the Assessor's Notice of Determination (mailed by August 15), property owners have until September 15, 2026 to appeal to the County Board of Equalization.

See if your Jefferson County home is over-assessed

Free analysis in 30 seconds. If the numbers support a appeal, your complete evidence packet is $49.

✓ All 50 states✓ Instant results✓ $49 flat fee
Colorado homes beneath snow-covered mountains. Jefferson County appeal guide.

How Jefferson County Assesses Property

6.25%of market value

Assessed by: Jefferson County Assessor's Office

Assessment cycle: biennial

Notices typically mailed: May 1 annually

Jefferson County assesses property using a two-step process: the Assessor determines your property's actual (market) value based on sales data, then applies the residential assessment ratio to calculate your assessed value. For tax year 2026, the residential assessment rate is 6.25% for local government entities and 7.05% for school districts. For example, if your home's market value is $632,958 (Jefferson County's current median), at the 6.25% assessment ratio your assessed value would be $39,560, resulting in approximately $2,797 in annual taxes at the county's effective rate of 0.66%. This demonstrates why even small errors in market value determination can significantly impact your tax bill.

The Appeal Process

Appeals are heard by the County Board of Equalization. The County Board of Equalization conducts formal hearings where both you and the Assessor's Office present evidence. Hearings must conclude by November 1, with decisions issued within five business days. The process is designed for homeowners to represent themselves, though you may bring professional representation if desired.

1

Step 1: Review your Notice of Value (NOV) mailed May 1 and gather evidence. Use the Jefferson County Assessor's comparable sales search tool at https://propertysearch.jeffco.us/ to find recent sales of similar homes from July 1, 2022 to June 30, 2024 that support a lower valuation.

2

Step 2: File your appeal online, by mail, or in person between May 1 and June 8, 2026. Explain why you believe the assessed value is incorrect and include supporting evidence such as comparable sales data, photos of property defects, repair estimates, or documentation of errors in property records (square footage, room count, etc.).

3

Step 3: Request an informal review with an appraiser from the Assessor's Office. During this meeting, you can discuss your concerns and evidence. Many appeals are resolved at this informal stage without proceeding further.

4

Step 4: Receive the Assessor's Notice of Determination by the last working day in August. If you disagree with this decision, you must file an appeal with the County Board of Equalization by September 15, 2026.

5

Step 5: Attend your Board of Equalization hearing if your appeal proceeds to this level. The Board must conclude hearings by November 1 and notify you of its decision within five business days. Present your evidence and be prepared to answer questions about your property's value.

6

Step 6: If dissatisfied with the Board of Equalization decision, you have three options within 30 days of the decision: (1) appeal to the Colorado Board of Assessment Appeals, (2) file in District Court, or (3) pursue binding arbitration administered by the Board of Equalization.

7

Step 7: For state-level appeals beyond the county, file with the Board of Assessment Appeals (most common and cost-effective option) or pursue District Court appeal for a de novo hearing. The Board of Assessment Appeals conducts videoconference hearings and reviews evidence from both parties.

Required form: Appeal form available through Jefferson County Assessor's online portal or by calling 303-271-8600

Filing Methods

online:https://www.jeffco.us/658/Assessor - File through the Assessor's online portal
mail:Mail to: Jefferson County Assessor, 100 Jefferson County Parkway, Suite 2500, Golden, CO 80419 (must be postmarked by June 8)
in-person:Visit Jefferson County Assessor's Office at 100 Jefferson County Parkway, Suite 2500, Golden, CO 80419, Monday-Thursday 7:30 AM - 5:00 PM. Book an appointment online in advance.

Evidence to Bring

Comparable sales data from similar properties in your area (sales from July 1, 2022 to June 30, 2024)Photos documenting property defects, damage, or deferred maintenanceRepair estimates or contractor quotes for needed workIndependent appraisal report (optional but helpful)Documentation of factual errors in property records (incorrect square footage, room count, lot size, etc.)Market analysis showing declining values in your neighborhood

Jefferson County Assessor Contact

Jefferson County Assessor's Office

Phone: 303-271-8600

Address: 100 Jefferson County Parkway, Suite 2500, Golden, CO 80419

Website: https://www.jeffco.us/658/Assessor

Online Portal: https://propertysearch.jeffco.us/

Hours: Monday - Thursday, 7:30 AM - 5:00 PM

Tax Exemptions in Jefferson County

Senior Property Tax Exemption

50% of the first $200,000 of actual value (maximum exemption of $100,000)

Reduces the taxable value of qualifying senior citizens' primary residence, providing significant tax savings year after year.

Eligibility: Must be at least 65 years old on January 1 of the application year, have owned and occupied the property as primary residence for at least 10 consecutive years. The state reimburses the county for the exempted tax.Deadline: July 15

Disabled Veterans Property Tax Exemption

50% of the first $200,000 of actual value (maximum exemption of $100,000)

Provides property tax relief for qualifying disabled veterans on their primary residence, with the state reimbursing the county for lost revenue.

Eligibility: Must be honorably discharged veteran with VA certification of 100% permanent service-connected disability or individual unemployability status. Must own and occupy property as primary residence as of January 1. Surviving spouses who remain unmarried may continue to receive the exemption.Deadline: July 1

Qualified Senior Primary Residential Property Tax Classification

Similar tax relief benefits as the senior exemption program

Temporary classification available for tax years 2025 and 2026 for seniors who moved and lost their senior exemption but meet specific requirements.

Eligibility: Property owners who previously received the senior exemption in 2020 or later but are no longer eligible due to moving. Must meet specific requirements detailed in the application.Deadline: March 15

Jefferson County Appeal Statistics

% Who Appeal

3-5% nationally

Jefferson County Appeal Packet · $49

Comparable sales evidence, county-specific filing guide, and professional cover letter. Enter your address to get started.

✓ All 50 states✓ Instant results✓ $49 flat fee

Frequently Asked Questions

What is the deadline to appeal my property taxes in Jefferson County for 2026?
The initial appeal deadline in Jefferson County is June 8, 2026, with appeals accepted beginning May 1. Any mailed appeal must be postmarked no later than June 8. If you receive a Notice of Determination from the Assessor and disagree with their decision, you have a second opportunity to appeal to the County Board of Equalization by September 15, 2026. It's better to appeal early in May to avoid the rush and potential delays during the final days of the filing period.
How do I file a property tax appeal online in Jefferson County?
To file your appeal online, visit the Jefferson County Assessor's website at https://www.jeffco.us/658/Assessor and access their online appeal portal. You'll need to explain why you believe the assessed value is incorrect and upload supporting documentation such as comparable sales data, photos of property defects, or repair estimates. The online system allows you to submit your appeal electronically along with all supporting documents. You can also schedule an appointment with an appraiser for an informal review through the website, which often helps resolve appeals without a formal hearing.
What evidence do I need for a successful Jefferson County property tax appeal?
The strongest evidence includes recent comparable sales of similar properties in your neighborhood from the July 1, 2022 to June 30, 2024 sales study period that Jefferson County used for valuations. Use the Assessor's comparable sales search tool at https://propertysearch.jeffco.us/ to find supporting data. Additionally, provide photos documenting any property defects, damage, or deferred maintenance, along with contractor repair estimates. Documentation of factual errors in your property records (such as incorrect square footage or room count) is also compelling evidence. An independent professional appraisal can strengthen your case, though it's not required.
What is the Senior Property Tax Exemption worth in Jefferson County?
The Senior Property Tax Exemption in Jefferson County reduces your taxable value by 50% of the first $200,000 of your home's actual value, providing a maximum exemption of $100,000. For example, if your home is valued at $400,000, your taxable value would be reduced from $400,000 to $300,000, saving you approximately $715 annually based on a typical mill levy of 100.000. To qualify, you must be at least 65 years old on January 1, have owned and occupied your property as your primary residence for at least 10 consecutive years, and apply by July 15 of the tax year.
What happens at a Board of Equalization hearing in Jefferson County?
At a Jefferson County Board of Equalization hearing, you'll present your evidence to an independent panel explaining why you believe your property's assessed value is too high. The Assessor's Office will also present their evidence supporting the valuation. The hearing is formal but designed for homeowners to represent themselves without an attorney. You should bring all your supporting documentation including comparable sales data, photos, and any other evidence. The Board must conclude all hearings by November 1 and will notify you of their decision within five business days. If you disagree with the Board's decision, you have 30 days to appeal to the state Board of Assessment Appeals, District Court, or pursue binding arbitration.
How much can I save by appealing my property taxes in Jefferson County?
With Jefferson County's median home value at $632,958 and effective tax rate of 0.66%, even a modest 10% reduction in your assessed value could save you approximately $280 per year, with savings continuing annually until the next reassessment. If your property is overvalued by 15-20%, you could save $400-$550 or more annually. The actual savings depend on your property's specific situation and the strength of your evidence. According to national data, between 30% and 50% of homeowners who file appeals achieve some reduction, and since filing is free in Jefferson County and your value cannot be increased as a result of an appeal, the risk-reward ratio strongly favors appealing if you have good evidence.
What if I miss the June 8 appeal deadline in Jefferson County?
If you miss the June 8 initial appeal deadline, you may still have options. If you receive the Assessor's Notice of Determination (mailed by August 15) and disagree with it, you can file an appeal to the County Board of Equalization by September 15, 2026. Additionally, you may be able to correct an erroneous valuation through the abatement process for up to two prior years, though this procedure is similar to a Board of Equalization appeal and can take several months to complete. The abatement option is available for corrections of errors or omissions but has stricter requirements than a regular appeal. For 2027, mark your calendar for the May 1 start of the next appeal period.
Does Jefferson County require biennial or annual property reassessments?
Jefferson County conducts biennial (every two years) full reappraisals of all properties, as required by Colorado state law. Property values are set based on what properties were worth on June 30 of even-numbered years, using sales data from a two-year study period. For the current tax year 2026, valuations were based on sales from July 1, 2022 to June 30, 2024. While full reappraisals occur every two years, tax year 2026 is an intervening year, meaning only properties with changes due to modifications (such as new construction, additions, or improvements) received updated valuations and Notice of Value postcards.

Official Resources

Jefferson County Assessor's Office →

Official website for the Jefferson County Assessor with property search, appeal information, exemption applications, and online filing portal.

Jefferson County Property Records Search →

Search for property information, view assessments, find comparable sales data, and access property records for any address in Jefferson County.

Colorado Board of Assessment Appeals →

State-level appeals board for property owners who disagree with County Board of Equalization decisions, with electronic filing system and hearing information.

Colorado Division of Property Taxation →

State agency providing property tax resources, exemption information, assessment ratio details, and guidance on the Colorado property tax system.

For state-wide appeal information including Colorado's assessment ratio and deadlines, see our Colorado Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More Colorado Counties

Adams County (Brighton)Arapahoe County (Aurora)Boulder County (Boulder)Denver County (Denver)Douglas County (Castle Rock)Eagle County (Eagle)
← All Colorado property tax appeal info

Sources: https://www.jeffco.us/4593/20252026-Property-Valuation-and-Appeal-I | https://www.jeffco.us/435/Appealing-Real-Property-Valuation | https://www.jeffco.us/DocumentCenter/View/51117/Jefferson-County-Valuation-Press-Release-PDF | https://dpt.colorado.gov/locality/jefferson-county-assessor | https://www.jeffco.us/3424/Property-Exemption | https://worldpopulationreview.com/us-counties/colorado/jefferson-county

Last verified: 2026-07-22