AppealDesk

Adams County Property Tax Appeal — Colorado

Rob HartleyRob Hartley·Updated February 15, 2026

Adams County, Colorado is located north and east of Denver, with the county seat in Brighton. The county includes major population centers such as Commerce City, Northglenn, Thornton, and Westminster. With a median home value of $425,000, the county's median annual property tax bill of $2,770 is above the national median of $2,400, while the effective property tax rate of 0.60% is significantly lower than the national median of 1.02%.

Notable cities: Brighton, Commerce City, Northglenn, Thornton, Westminster

Median Home

$425,000

Tax Rate

0.60%

Annual Tax

$2,770

Population

520,000

2026 Appeal Deadline: May 1 through June 8, 2026

You have from May 1 to June 8 each year to appeal your property tax assessment, regardless of whether it's a revaluation year or intervening year

Property in Adams County, Colorado — local tax assessment and appeal guide

How Adams County Assesses Property

6.8%of market value

Assessed by: Adams County Assessor's Office

Assessment cycle: biennial

Notices typically mailed: May

In Colorado, property tax is calculated using an assessment ratio rather than the full market value of your home. If your home's market value is $425,000, at Colorado's 6.8% assessment ratio your assessed value would be $28,900, resulting in approximately $2,581 in annual taxes at Adams County's effective rate of 0.60%.

The Appeal Process

Appeals are heard by the County Board of Equalization. Hearings are conducted via telephone conference or at the Adams County Government Center. You'll present your evidence to hearing officers who will make recommendations to the Board.

1

Step 1: Review your Notice of Valuation or assessment notice received in May to determine if you disagree with the assessed value

2

Step 2: Gather evidence including comparable sales from the relevant time period, photos of property condition, and any repair estimates or appraisals

3

Step 3: File your appeal between May 1 and June 8 using the online portal at https://assessor.adcogov.org/AdamsCountyNOVs/ or by mail

4

Step 4: Participate in the informal review with the Assessor's Office who will issue a Notice of Determination with their decision

5

Step 5: If you disagree with the Notice of Determination, appeal to the County Board of Equalization by submitting all evidence again with your signed Notice of Determination

6

Step 6: Attend your Board of Equalization hearing where hearing officers will review evidence and make a recommendation

7

Step 7: If still unsatisfied, request binding arbitration within 30 days of the BOE decision or appeal to the state Board of Assessment Appeals

Required form: Online appeal form or letter of disagreement

Filing Methods

online:File online at https://assessor.adcogov.org/AdamsCountyNOVs/
mail:Mail appeal to Adams County Assessor, 4430 S. Adams County Pkwy., Suite C2100, Brighton, CO 80601
in-person:Submit at 4430 S. Adams County Pkwy., Suite C2100, Brighton, CO 80601

Evidence to Bring

Comparable property salesPhotos of property conditionProfessional appraisalsRepair estimatesDocumentation of property defects

Adams County Assessor Contact

Adams County Assessor's Office

Phone: (720) 523-6038

Address: 4430 S. Adams County Pkwy., Suite C2100, Brighton, CO 80601

Website: https://adcogov.org/assessor

Online Portal: https://assessor.adcogov.org/AdamsCountyNOVs/

Hours: Monday - Friday 8:00 AM - 4:30 PM

Tax Exemptions in Adams County

Senior Property Tax Exemption

50% of first $200,000 of value

50% of the first $200,000 of actual value is exempted for qualifying seniors

Eligibility: Must be 65+ years old, owned and occupied home as primary residence for 10 consecutive yearsDeadline: July 1

Disabled Veteran Exemption

50% of first $200,000 of value

50% of the first $200,000 of actual value is exempted for qualifying disabled veterans

Eligibility: Veterans with 100% permanent disability rating who have owned and occupied home as primary residenceDeadline: July 1

Religious/Charitable Exemption

100% exemption

Property owned and used solely for religious, private schools, or charitable purposes

Eligibility: Must be used exclusively for qualifying purposes and file annual applicationDeadline: Contact Assessor's Office

Official Resources

Adams County Assessor Website →

Official Adams County Assessor site with forms, exemption applications, and property search tools

Adams County Online Appeal Portal →

File your property tax appeal online during the May 1 - June 8 appeal period

Adams County Property Search →

Search for property values, ownership information, and tax details for any Adams County property

Colorado Division of Property Taxation →

State property tax information, forms, and resources for Colorado property owners

Adams County Appeal Statistics

Avg Reduction

$700

% Who Appeal

25%

Check Your Adams County Assessment

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Frequently Asked Questions

What is the deadline to appeal my property taxes in Adams County?
The deadline to appeal your property taxes in Adams County is June 8, 2026. The appeal period opens on May 1 and runs through June 8 each year. This deadline applies whether it's a revaluation year (odd years) or an intervening year (even years). You must file your appeal during this window or you'll have to wait until the following year to challenge your assessment.
How do I file a property tax appeal in Adams County online?
To file online, visit https://assessor.adcogov.org/AdamsCountyNOVs/ during the appeal period from May 1 to June 8. You'll need your account number and access key from your Notice of Valuation. If you don't have your access key, call the Assessor's Office at(720) 523-6743. The online system allows you to submit your appeal and upload supporting documentation such as comparable sales and photos of your property.
What is the senior homestead exemption worth in Adams County?
The senior homestead exemption in Adams County provides a 50% reduction on the first $200,000 of your home's actual value. To qualify, you must be at least 65 years old, have owned your home for 10 consecutive years, and occupied it as your primary residence for those 10 years. The application deadline is July 1, and once approved, the exemption continues without needing to reapply annually. The state reimburses the county for the exempted taxes.
What happens at a Board of Equalization hearing in Adams County?
At your Board of Equalization hearing, you'll present your evidence to hearing officers via telephone conference or in person at the Adams County Government Center. The Assessor's representative will also present their evidence and may even request an increase in value. You should resubmit all evidence you provided during your initial protest, including comparable sales, photos, and appraisals. The hearing officers will review both sides and make recommendations, with decision letters sent within five business days after adoption by the Board.
How much can I save by appealing my property taxes in Adams County?
Successful property tax appeals in Adams County save homeowners an average of $700 per year, though savings vary based on the property and strength of evidence. Nationwide data shows that about 25% of homes are overassessed, paying an average of $1,346 too much annually. With Adams County's median tax bill at $2,770, even a modest 10-15% reduction in assessed value could save you $300-400 per year. The key is presenting strong evidence like recent comparable sales showing your property is overvalued.
What evidence do I need for an Adams County property tax appeal?
For a successful Adams County property tax appeal, you'll need comparable sales of similar properties from the relevant time period (check with the Assessor for specific dates), professional appraisals, photos documenting property condition or defects, repair estimates from licensed contractors, and any other documentation showing your property is overassessed. The Assessor uses sales data from specific periods to determine values, so ensure your comparables align with their valuation dates. You can request the Assessor's supporting data within three working days of your written request.
Can I appeal my property taxes in Adams County during even-numbered years?
Yes, you can appeal your property taxes in Adams County during both odd and even-numbered years. While Colorado reassesses all properties in odd years and sends Notice of Valuation to all property owners, you still have the right to appeal during even years (intervening years) if you believe your property is overvalued. The appeal window remains the same: May 1 through June 8. In even years, you'll need to contact the Assessor's Office or check online for your current assessment rather than waiting for a mailed notice.
What is binding arbitration for property tax appeals in Adams County?
Binding arbitration is a final appeal option in Adams County if you're unsatisfied with the Board of Equalization decision. You must request arbitration within 30 days of receiving your BOE decision letter. The arbitration hearing is held at the Adams County Government Center or remotely, and the arbitrator's decision is final and legally binding. This is an alternative to appealing to the state Board of Assessment Appeals or district court, offering a potentially faster resolution but without further appeal options.

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

Arapahoe County (Littleton)Denver County (Denver)Douglas County (Castle Rock)El Paso County (Colorado Springs)Jefferson County (Golden)
← All Colorado property tax appeal info

Sources: https://adcogov.org/board-equalization | https://www.tax-rates.org/colorado/adams_county_property_tax | https://www.ownwell.com/trends/colorado/adams-county | https://adcogov.org/exemptions

Last verified: 2026-02-15