State guide
Colorado property taxes (2026)
✓ Verified August 2026 against official county pages — 3 sources linked below.
Your county
More Colorado counties are being verified and added.
How Colorado property taxes work
Colorado property taxes run on a two-year rhythm: county assessors revalue all real property in odd-numbered years, and those values carry into the even year unless something changes. Notices of Valuation mail by May 1, and rates here are spoken in mill levies — one mill is $1 of tax per $1,000 of assessed value.
Assessed value is not market value. For tax year 2026, homes are assessed at 7.05% of actual value for school district taxes and 6.8% for everything else — and for the local-government side, your home's actual value is first reduced by 10% (up to $70,000 off). Multiply the assessed value by your area's total mill levy and you have your bill.
The appeal window is short and early: assessors hear real-property protests from May 1 through June 8 (C.R.S. 39-5-122). Some counties adopt an alternate procedure with a later deadline — Denver runs protests to November 15 — so your county's page has the date that actually applies.
The county treasurer mails tax statements each January for the prior tax year. You can pay in halves — first half by the last day of February, second half by June 15 — or in full by April 30. Mill levies are certified each December, which is when next year's rates become real numbers.
When payments are due
Pay in halves — last day of February and June 15 — or in full by April 30. Statements mail in January.
| Payment | Due | Delinquent after | Notes |
|---|---|---|---|
| First half (2026 taxes) | February 28, 2027 | — | Due the last day of February; 1% per month interest once delinquent |
| Second half (2026 taxes) | June 15, 2027 | — | |
| Or pay in full | April 30, 2027 | — | Single-payment option |
How to appeal your assessment
The statewide rule: File your protest with the county assessor between May 1 and June 8 — counties using the alternate procedure (like Denver) extend the deadline to November 15
Notices of Valuation mail by May 1. In revaluation (odd) years everyone gets a new value; in even years you can still protest. Miss the assessor window and the next stop is the County Board of Equalization — but the June window is the one to hit.
- Read your Notice of Valuation in MayIt shows the assessor's new actual value for your home. In odd years this is a full revaluation based on sales through the prior June 30.
- Check the comparablesYour case is sales of similar homes in your area during the assessor's study period — most county assessor sites let you pull the sales they used.
- File your protest by June 8Online, by mail, or in person with your county assessor (November 15 in alternate-procedure counties like Denver). Filing is free.
- Get the assessor's decisionThe assessor mails a Notice of Determination in the summer.
- Escalate if neededAppeal the determination to the County Board of Equalization, and beyond that to the Board of Assessment Appeals, district court, or arbitration.
County pages have the exact local deadlines, forms, and filing links.
Statewide exemptions
| Exemption | What it's worth | Deadline |
|---|---|---|
| Senior homestead exemption | Cuts the taxed value of the home for qualifying homeowners 65+ who have owned and lived in it for 10+ years; the state reimburses local governments | Apply by July 15 |
| Disabled veteran exemption | A parallel exemption for veterans with a service-connected disability rated 100% permanent, and for Gold Star spouses | Apply by July 15 |
| Property tax deferral | Seniors and active-duty military can defer payment (the state pays the county and holds a lien) — a cash-flow tool, not a discount | Apply by April 1 |
Reassessment
All Colorado real property is revalued in odd-numbered years; even-year values carry over unless the property changes. The next statewide revaluation takes effect with 2027 Notices of Valuation on May 1, 2027.
Value notices (Notice of Valuation) usually mail in May.
Common questions
- When are property taxes due in Colorado?
- Statements mail in January for the prior year. Pay in halves — first half by the last day of February, second half by June 15 — or in full by April 30. Late payments accrue 1% interest per month.
- How do I appeal my Colorado property valuation?
- File a protest with your county assessor between May 1 and June 8 — free, and online in most counties. Denver's alternate procedure runs to November 15. If the assessor says no, escalate to the County Board of Equalization.
- What is a mill levy?
- One mill is $1 of tax per $1,000 of assessed value. Your total mill levy stacks your school district, county, city, and special districts — multiply it by your assessed value (not market value) and divide by 1,000 for your bill.
- How is my home's assessed value calculated in 2026?
- Two ways at once: 7.05% of actual value for school taxes, and 6.8% for local governments — after first knocking 10% (up to $70,000) off the actual value on the local side. The split is new from recent legislation.
- Why did my value change when I didn't do anything?
- Colorado revalues all real property in odd-numbered years based on the prior sales period. Your value resets with the May 1 Notice of Valuation in odd years and generally carries over in even years.
- When do 2027 values come out?
- May 1, 2027 — the next odd-year revaluation. That's Colorado's big appeal moment: the protest window runs May 1 through June 8, 2027 in most counties.
Sources
Every fact on this page comes from an official page. Check them yourself:
- Summit County — Understanding Property Taxes in Colorado (2026 assessment rates) — checked 2026-08-12
- City & County of Denver — Property Tax Calendar — checked 2026-08-12
- C.R.S. § 39-5-122 — checked 2026-08-12