2027 Colorado Property Reassessment: Is Your Value Too High?

Here's something most Denver metro homeowners don't have on their calendar yet: 2027 is a Colorado property reassessment year. By May 1, your county assessor will mail a new value for your home, and that number sets your property taxes for 2027 and 2028. You'll have until June 8 to protest it. In this post we walk through what the 2027 Colorado property reassessment is, why a flat market matters this time, and exactly what to check on your notice.

What is the 2027 Colorado property reassessment?

It's the every-two-years reset of every home's value for property tax purposes. Colorado reappraises property in odd-numbered years, and the reappraisal-year value is generally used for the following year too (Douglas County Assessor). So the number you get in May 2027 is the one your 2027 and 2028 tax bills are built on.

The value isn't based on what homes are selling for in spring 2027. It's based on the market as of the appraisal date, June 30, 2026. Assessors look at sales from a study period that ends that day. In the last cycle, Boulder County used 24 months of sales, July 1, 2022 through June 30, 2024 (Boulder County, April 23, 2026). Your own notice will print the exact period your county used, so check it there.

Did Denver home prices go up between 2024 and 2026?

Barely. That's the big story for this reassessment. Your 2025 value was based on the market as of June 30, 2024. Your 2027 value resets to June 30, 2026. Across the metro, prices hardly moved in between.

• DMAR (11-county Denver metro): median close price of $605,000 in April 2026, nearly unchanged from $604,000 in April 2025 and $602,000 in April 2024 (DMAR Market Trends Report, April 2026 data, published May 5, 2026).
• DMAR, June 2026: detached homes had a median of $675,000, up 1.5% from a year earlier, while attached homes had a median of $391,750, down 2.06% (ColoradoBiz, July 6, 2026).
• SMDRA (seven-county south metro area): median price of $610,000 in June 2026, up 0.8% from $605,000 in June 2025 (SMDRA Market Statistics, June 2026).
• Denver condos: one Denver broker's analysis found condos in the city and county of Denver down 14.3% from their 2022 peak of $370,000 (Denverite, Aug. 5, 2026).

DMAR and SMDRA cover different areas, so read each number on its own rather than side by side.

What this means for you: We believe a flat market should mean a flat-ish value. If your notice shows a big increase, especially on a condo or townhome, ask why. Your tax bill also depends on assessment rates and local mill levies, which are set separately from your value. Your value is the one piece you can protest.

And if you're shopping for a home or thinking about a refinance, the national 30-year fixed rate averaged 7.24% for the week of Oct. 29, 2026, down from 7.32% the week before (Freddie Mac PMMS). For more on rates and the Fed, see our November 2026 Denver housing market update.

When is the 2027 property tax protest deadline?

June 8, 2027. Notices of Valuation go out by May 1, and protests to the assessor are accepted May 1 through June 8. Adams County notes that appeals postmarked after June 8 can't be accepted (Adams County Assessor).

If the assessor doesn't lower your value, you'll get a Notice of Determination by Aug. 15. From there you can appeal to your County Board of Equalization by Sept. 15 (Adams County Assessor).

Homeowner 101: what "actual value" means on your notice

Actual value is the assessor's estimate of what your home was worth on the appraisal date, June 30, 2026. It is not your tax bill. Think of it like the price tag the county puts on your home before doing the tax math.

Your tax bill takes that actual value, applies the state's assessment rate, and then multiplies by the mill levies of your local districts (schools, county, city, fire and so on). Here's a simplified version with example numbers only: if your home's actual value is $600,000 and your neighbor's is $660,000, and everything else is the same, your neighbor's bill is about 10% higher. That's why a value that's too high costs you every year it's in place.

Because the reassessment value carries into the next year too, an error on a 2027 notice can follow you through two tax bills.

7 things to check on your 2027 Notice of Valuation

1. The value change from 2025. Your notice shows the prior value next to the new one. With metro prices close to flat from 2024 to 2026, a large jump deserves a reason (DMAR).
2. Finished square footage. Compare it to your own records or a past appraisal. A square footage error is one of the simplest things to correct.
3. Bedroom and bathroom count. An extra bathroom on paper adds value you don't have.
4. Basement finish. "Finished" versus "unfinished" can make a real difference. Make sure the record matches what's actually down there.
5. Condition. Mass appraisal models don't see an aging roof, an old furnace or foundation work. DMAR's June 2026 report noted buyers are paying more for move-in-ready homes and negotiating harder on homes that need work (ColoradoBiz).
6. The study period. Find the sales dates printed on your notice. Only sales from that window, adjusted to June 30, 2026, really count in a protest.
7. Your property type. If you own a condo or townhome, look extra closely. Attached prices fell over the year to June 2026, and Denver condos sit well below their 2022 peak (Denverite).

How do I protest my property value in my county?

You file with your county assessor between May 1 and June 8, 2027. Most metro counties take protests online, by mail or in person, and your notice lists your exact options and account number. Douglas County, for example, offers online appeals, mail, or a meeting with an appraiser (Douglas County Assessor).

• Denver Assessment Division
• Jefferson County Assessor appeals
• Arapahoe County Assessor appeals
• Douglas County Assessor appeals
• Adams County Assessor appeals process
• Boulder County Assessor appeals
• Broomfield Assessor appeal information

The strongest protests are simple: point out any errors in your property record, then show a few similar nearby homes that sold during the study period for less than your new value. If you'd like help pulling those sales, we'll put together a free Property Assessment Review Packet for your home.

Frequently asked questions

When will I get my 2027 Notice of Valuation?

By May 1, 2027. Colorado assessors mail real property Notices of Valuation by May 1 in reappraisal years (Adams County Assessor).

Can I protest my property taxes or only my value?

Only your value and classification. The assessor doesn't set tax rates, so a protest to the assessor is about whether your home's value is right (Boulder County).

Can someone file the protest for me?

The owner files. In Adams County, anyone else filing for you needs a notarized letter of authorization with the appeal (Adams County Assessor). We help homeowners gather the data, and they file it themselves.

What if my protest is denied?

You'll get a Notice of Determination by Aug. 15, and you can appeal to your County Board of Equalization by Sept. 15 (Adams County Assessor).

Do I need to do anything now?

Not yet, but it helps to start a list of anything about your home the county might not know, like an older roof, foundation repairs or a basement that isn't finished the way the records say. You'll want it in May.

A note from Kasey and Allison

We'd rather you hear about this in November than find out in June. Mark May 1 and June 8 on your calendar, keep an eye on your mailbox, and if your number looks off, reach out. We're happy to pull the right comps for you, no strings attached. Curious what your home is worth today? Try our free home value analysis, see how much equity you have, or book a quick call.

Kasey & Allison Learned
5thGEN Group | Real Broker, LLC

Sources

• Denver Metro Association of Realtors, "DMAR Real Estate Market Trends Report | APR. '26," published May 5, 2026, April 2026 data. Link. Checked Nov. 3, 2026.
• ColoradoBiz, "Denver metro housing market balanced as buyers gain leverage," July 6, 2026, June 2026 DMAR data. Link. Checked Nov. 3, 2026.
• South Metro Denver Realtor Association, "SMDRA Market Statistics - June 2026," June 2026 data. Link. Checked Nov. 3, 2026.
• Denverite, "Denver condo prices down," Aug. 5, 2026. Link. Checked Nov. 3, 2026.
• Freddie Mac, "Primary Mortgage Market Survey," week of Oct. 29, 2026. Link. Checked Nov. 3, 2026.
• Adams County Assessor, "Appeals Process." Link. Checked Nov. 3, 2026.
• Douglas County Assessor, "Appeals." Link. Checked Nov. 3, 2026.
• Boulder County, "Assessor's Office opens 2026 real property appeal window May 1 through June 8," April 23, 2026. Link. Checked Nov. 3, 2026.