Lower your Douglas County property taxes
The Douglas County Assessor revalues homes in Castle Rock, Highlands Ranch, Parker, Castle Pines and the rest of the county every two years, and 2027 values will reflect the market as of June 30, 2026. In 2025, median residential changes ranged from −10% to +5%, the widest swing in the metro area. 30% of first-year savings, only if you save.
What a too-high value costs you
If your home is assessed at $720,000 but similar homes point to about $670,000, you're taxed on $50,000 too much. At a 0.52% rate that's about $260 a year. Our fee would be $78; you'd keep $182.
What gets missed in Douglas County
- The 2027 reappraisal. Every home gets a new value in May 2027, based on sales up to June 30, 2026. Each reappraisal is a fresh chance to protest.
- Wide value swings. Douglas County medians moved from −10% to +5% in 2025. The model can miss homes at either end.
- Metro district levies. Many subdivisions carry metro district levies, pushing some total levies past 140 mills. Overvaluation costs more there.
- Condition. An original kitchen, an aging roof or a cracked foundation doesn't show up in the assessor's records.
Insider tip: Douglas County publishes residential value changes by neighborhood and a Value Data Explorer. Compare your change with your neighborhood's before you file online.
Reviewed by the founder
Julien reviews every Douglas County case personally and tells you the value we’ll ask for before anything is filed.
Get my free reviewDouglas County calendar
| June 30, 2026 | Appraisal date: 2027 values reflect the market on this day |
| By May 1, 2027 | Douglas County Assessor mails Notices of Valuation (May 1 is a Saturday) |
| May 1 – June 8, 2027 | File your protest with the Douglas County Assessor |
| By August 15, 2027 | Douglas County Assessor sends written Notices of Determination |
| September 15, 2027 | Deadline to appeal to the County Board of Equalization |
| By November 1, 2027 | County Board of Equalization decides appeals |
| 30 days after the decision | Appeal to the Board of Assessment Appeals, binding arbitration or district court |
| January 2028 | Tax bills for 2027 mailed |
Sources: Douglas County Assessor — 2025/2026 valuation · Douglas County — County Board of Equalization · Douglas County — 2025 tax districts and mill levies. Dates are checked each year; confirm with the county for your property.
Exemptions to check
If you're 65 or older and have owned and lived in your home for at least 10 years, the senior exemption takes 50% off the first $200,000 of actual value. Qualifying disabled veterans get the same exemption. For 2026, the local-government part of your tax is figured on your value minus 10% of the first $700,000. We check your exemptions free at sign-up.
Douglas County questions
How do I appeal in Douglas County?
Online through the Assessor's website, or with the appeal form by mail or in person, May 1 – June 8.
When will I hear back?
Douglas County mails Notices of Determination on August 15, and County Board of Equalization appeals are due September 15. Hearing officers finish cases by November 1.
I missed the deadline. Now what?
Sign up anyway. We'll track your value and file in the next window, which opens May 1, 2027.