2026 Property Tax Due Dates
February 28
First half (or full by April 30)
June 15
Second half
Payment Methods
Online, Mail, In-Person
Adams County Treasurer
Phone
(720) 523-6160Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Adams County Treasurer
In Person
Visit the Treasurer's office — 4430 S Adams County Pkwy, 2nd Floor, Suite C2436, Brighton CO 80601, Mon-Fri 8am - 4:30pm
About Property Taxes in Colorado
Colorado property taxes are administered at the county level. Property is assessed at its actual value (market value) as determined by the county assessor. Colorado conducts countywide reassessments every two years (odd years), meaning values are updated on a two-year cycle. Colorado has recently enacted significant property tax relief legislation to address rapid home value appreciation. The residential assessment rate — the percentage of market value that is taxable — has been reduced and is subject to legislative adjustment. Always confirm the current assessment rate with your county assessor, as it may change year to year.
Payment & Assessment
Colorado property taxes for the prior year are due in the current year. You have two options: Option 1 (single payment): Pay the full amount by April 30. Option 2 (two installments): Pay the first half by February 28, and the second half by June 15. A penalty of 1% per month applies to late payments. Taxes remaining unpaid for several years can result in a tax lien sale. Most Colorado counties offer online payment through the county treasurer's website. Payment by mail and in person is also available.
Statewide framework for Colorado. Your county's specific rates and deadlines are shown above.
Other Counties in Colorado
About Adams County
Adams County is a county located in the U.S. state of Colorado. As of the 2020 United States census, the population was 519,572. The county seat is Brighton, and the largest city is Thornton. The county is named for Alva Adams, an early Governor of the State of Colorado in 1887–1889. Adams County is part of the Denver metropolitan area.
Source: Wikipedia — content available under CC BY-SA 4.0
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.