How To Protest Your Property Taxes In Summit County Colorado?
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Colorado reappraises property values every two years. Reappraisals occur in odd-numbered years – 2025 was a reappraisal year in Colorado – and when the new Notice of Valuation arrives showing a sharp increase, many homeowners in Summit County face the same question: is the number accurate, and is it worth appealing? A property tax appeal is a formal objection to the assessed value assigned to your property by the county assessor. Filing one can reduce your tax bill for the full two-year cycle. This guide covers when an appeal makes sense, how the process works in Summit County, and what to do if the first decision goes against you.
What Is a Property Tax Appeal?
The property tax appeal process in Colorado runs through three levels: an informal review with the county assessor, a formal hearing before the County Board of Equalization (CBOE), and, if necessary, the State Board of Assessment Appeals, District Court, or Binding Arbitration. Most homeowners resolve their case at the first or second level.
Property tax revenue is used to support public schools, county governments, special districts, municipal governments, and junior colleges. All of the money raised from property taxes stays in the county. The calculation of property tax has the following components: property classification, actual value of the real estate property, assessment rate, assessed value, and tax rate (expressed as a mill levy). Since 2025, Summit County residential property has two assessment rates – one for local governments and the other for school districts.
Should I Appeal Property Tax Assessment Values?
This decision depends on one question: does the assessor’s value reflect what your property would actually sell for as of June 30, 2024 – the official appraisal date for the 2025-2026 cycle?
Common Reasons Homeowners File Appeals
The most common reasons to appeal a property tax assessment in Summit County:
- Comparable sales don’t support the value – if recent sales of similar properties in the market closed below the assessed value during the July 2022-June 2024 data window, that is direct evidence for a reduction
- Incorrect property data – wrong square footage, bedroom count, or lot size on record; these errors are straightforward to correct and often produce immediate reductions
- Market mismatch – Summit County properties vary dramatically; an assessor using broader county comparables may overvalue a property
- Condition issues – deferred maintenance, structural problems, or damage not reflected in the assessed value
When an Appeal May Not Be Worth It
If comparable sales in your market consistently support or exceed the assessed value, an appeal is unlikely to succeed and may not be worth the time. Appeals must use sales from the same property type – condo comparables for condos, single-family for single-family – and only from the July 2022-June 2024 window. Sales after June 30, 2024 are not accepted and will be considered in the 2027 reappraisal cycle instead.
How to Appeal Property Taxes Successfully
How to Appeal property taxes in Summit County comes down to evidence quality. The assessor’s office reviews submissions and responds – the strength of the comparable sales you provide determines the outcome more than any procedural factor.
Gather sales of properties with the same property type, similar size, age, condition, features, and location that closed between July 1, 2022 and June 30, 2024. Document any property condition issues with photographs. Review the assessor’s data on record for your property – incorrect characteristics are the fastest path to a correction. Appeals must be filed in writing by the current owner of record or an authorized agent with a Letter of Authorization signed by the owner of record. Multiple submissions for the same property are rejected, so compile everything before filing. You can submit your appeals (Appeal Form) using one of the following methods: by email to Appeals@summitcountyco.gov, by e-file using the online Protest Application, in person at 208 E. Lincoln Ave., Breckenridge, CO 80424, or using an alternate shipping method to this physical address, or by mail via USPS to PO Box 276, Breckenridge, CO 80424.
For high-value properties above $1 million – common in Breckenridge, where the April 2026 average sale price for single-family homes reached $2,751,908 – some owners engage a property tax professional or attorney who can provide expert advice and work on a contingency basis, collecting a fee only if the appeal succeeds.
Resort Real Estate tracks comparable sales and valuation trends across the Summit County market. Homeowners reviewing their assessment can contact the team at 970-389-8899 or nbassova@gmail.com for current market data.
Property Tax Appeal Process Step by Step
The property tax appeal process in Summit County follows a defined sequence:
- Review your Notice of Valuation – mailed by the assessor on May 1, 2026; check the property data on record for errors before building your case
- Gather comparable sales – same property type, similar size, age, and location, closed between July 1, 2022 and June 30, 2024; do not include sales after the appraisal date
- File a written protest – submit to the Summit County Assessor by the deadline; include all evidence in a single submission; multiple filings for the same property are rejected
- Assessor review – the office reviews your evidence and issues a decision; if the value is reduced, the updated Notice of Determination arrives
- Appeal to the CBOE if denied – if the assessor’s decision is unsatisfactory, file your real property appeal with the County Board of Equalization by July 15, 2026
- CBOE decisions are rendered on real and personal property appeals by August 5, 2026
- Further appeal if needed – decisions can be appealed to the Colorado Board of Assessment Appeals, District Court, or Binding Arbitration, though most cases resolve before this stage
Deadlines to Appeal Property Taxes in Summit County Colorado
The deadlines to appeal property taxes in Colorado are firm – courts treat it as jurisdictional, meaning one day late eliminates the right to appeal entirely, regardless of the merits of the case.
County Statutory Deadlines Dates for the Appeals
Key dates for the 2025–2026 reassessment cycle in Summit County:
| Event | Date |
| Notices of Valuation mailed | May 1, 2026 |
| Deadline to submit a real property appeal to Assessor | June 8, 2026 (real property) |
| Deadline to submit a personal property appeal to Assessor | June 30, 2026 |
| Deadline to submit a real property appeal to the County Board of Equalization (CBOE) | July 15, 2026 |
| Deadline to submit a personal property appeal to the County Board of Equalization (CBOE) | July 20, 2026 |
Summit County appeals must be in writing; late submissions are not accepted under any circumstances.
What Happens After You File an Appeal
After filing, the assessor’s office reviews the submitted evidence and issues a written decision. If the value is adjusted downward, the corrected notice arrives before the CBOE deadline, giving the owner the option to accept the reduction or continue to the next level. If the assessor denies the appeal or the reduction is insufficient, the owner has until July 15, 2026 to escalate to the CBOE.
The CBOE operates independently of the assessor’s office. Presenting the same evidence more clearly – with organized comparable sales, photographs, and a concise written argument – often produces different results at the board level than at the informal review stage.
How to Dispute Property Tax Assessment Decisions After a Denial
How to appeal property tax assessment decisions after a CBOE denial involves three remaining options: the State Board of Assessment Appeals (BAA), District Court, or Binding Arbitration. They require filing within 30 days of the CBOE decision.
The BAA is the more common path – hearings are conducted in writing or by telephone, and legal representation is not required. District Court offers a full de novo review but involves litigation costs that make it practical only for high-end properties where the tax savings justify the expense. At either level, the same evidence standard applies: comparable sales within the approved data window, accurate property characteristics, and documented condition issues.
Homeowners in Breckenridge, Keystone, Frisco, Dillon, Silverthorne, and Copper Mountain with questions about neighborhood property values and recent market data can reach Resort Real Estate Inc. at 970-389-8899 or nbassova@gmail.com before the filing deadline.
Disclosure: Please note, that this information is provided for general informational purposes only. It does not constitute professional advice. You are strongly encouraged to verify all information with qualified, certified and licensed professionals before making any decisions or taking any actions.
Sources
- Summit County Assessor’s Office
- Colorado Board of Assessment Appeals
- Colorado Judicial Branch
FAQ
Can a real estate agent help with a property tax appeal?
A local agent can provide comparable sales data – the core evidence in any appeal. Resort Real Estate tracks Summit County market transactions and can help homeowners identify whether recent sales support a lower assessed value before they file.
Do I need a professional appraisal to appeal my assessment?
Not for the initial protest. Comparable sales data is sufficient for most residential appeals. Note that appraisals with an effective date after June 30, 2024 are not accepted – the assessor’s data window closes at that date.
How much can property taxes change after a successful appeal?
A reduction in assessed value applies directly to the tax bill across both years of the cycle. Each case is different. You need to weigh everything carefully with all available details. Talk to a property tax professional or attorney with extensive knowledge of property valuation and the Colorado property tax system. Most likely they will give you expert advice and put together a strong appeal case.
Can vacation and second homeowners also qualify for appeals?
Yes. Whether you own a primary home, a vacation home, or an investment property, the appeal process is the same – same requirements and timelines apply regardless of the use of the property.
What mistakes reduce the chances of winning a property tax appeal?
Submitting sales after June 30, 2024, using the wrong property type for comparables, filing multiple submissions, and missing the deadline entirely. Weak evidence in appeal property tax assessment cases – generic market commentary without specific comparable sales – is the most common reason appeals are denied at the informal review stage.
Are there any tax exemption programs in Summit County?
Yes, there are some tax exemption programs, such as Colorado’s Senior and Veteran Exemption Programs in Summit County. Both programs provide for up to a 50% exemption from taxation on the first $200,000 of the real value of the qualifying applicant’s primary residence. Non-profits may also qualify for exemption from property tax if they are religious, charitable, fraternal/veteran organizations, or schools.