Larimer County, Colorado Property Tax Appeal Guide for 2027

What deadline matters first

For TaxSauce’s 2027 policy year, the projected Larimer County real-property protest period is May 1, 2027 through June 8, 2027. Larimer’s 2026 Real Property Protest Form used May 1 through June 8 and said mailed protests had to be postmarked no later than June 8; Colorado guidance also lists June 8 as the real-property protest date, with adjusted dates possible because of weekends and holidays (Larimer 2026 Real Property Protest Form, Colorado Division of Property Taxation).

As of this analysis on 2026-06-21, Larimer County had not yet published a 2027 real-property protest form. Use the 2027 Notice of Valuation and the 2027 county form as controlling if they give a different date.

Colorado’s process starts with the Larimer County Assessor. The Assessor is the county office that lists, classifies, and values property. If you file late, Larimer’s recent form says late protests are not accepted, so do not wait until the last day if you can avoid it.

For tax-bill context, Larimer County’s estimated effective property tax rate is about 0.50% of owner-occupied home value, based on county median taxes and values. That is only a broad county benchmark. Your actual bill depends on your property type, assessment rates, exemptions, and the overlapping mill levies for your tax area (Rate Gazetteer county benchmark).

A recent Larimer County volume and success reference shows why careful evidence matters: in 2025, the Assessor’s Office said it mailed just under 12,000 Notice of Determinations, nearly 50% of protested properties saw an adjustment, and the average adjustment was 11%. That past result is not a promise for any 2027 protest (Larimer County notice).

The common value appeal

The most common homeowner issue is Actual value. This means you believe the Assessor’s market value is too high.

For the 2027 cycle, the relevant Colorado valuation date is June 30, 2026. In plain English, the question is not “what would my home sell for in 2027?” The question is closer to “what did the market support for this home as of June 30, 2026?”

Colorado says residential property is valued using the market approach, which means comparable sales. A comparable sale is a sale of a similar property, usually near your home, that helps show what buyers were paying in the relevant period (Colorado Division of Property Taxation).

For TaxSauce’s 2027 policy snapshot, the conservative projected primary residential sale window is January 1, 2025 through June 30, 2026. Larimer’s prior-cycle practice may allow some additional older data, but the safest starting point is similar arm’s-length sales from the primary Colorado study period.

Other reasons you might appeal

Actual value means the market value is too high. Helpful proof usually includes comparable sales, adjusted in plain terms for differences such as location, size, age, quality, condition, lot features, views, basement finish, garages, and other features that buyers would notice.

Classification means the county put the property in the wrong use category. Classification can affect the assessment rate. For example, a property’s actual use as of January 1, 2027 may support a different classification than the one shown in county records. A protest is not a way to object only to the assessment rate itself.

Property record / characteristic correction means the Assessor’s records show a fact that is wrong or incomplete. Examples may include square footage, condition, room count, building features, or other characteristics that affect the mass-appraisal value. This is usually evidence supporting a corrected value or classification, rather than a separate tax-rate complaint.

If your Notice of Assessment says something else changed

A Notice of Assessment is the assessment notice that tells you the county’s value and classification for your property. In Colorado, the official notice is commonly called a Notice of Valuation. Colorado says real-property Notices of Valuation list the property’s location, classification, value-related characteristics, and actual value for the prior and current years (Colorado Division of Property Taxation).

Read the notice slowly. Compare the value, classification, and property characteristics with what you know about your home.

If the notice shows a change in classification, ask whether the county’s category matches the property’s actual use as of January 1, 2027. If the notice shows changed property details, gather proof such as photos, floor plans, inspection notes, permit records, or other documents that show the correct facts.

After the Assessor reviews a protest, Larimer uses a Notice of Determination (NOD) to tell the property owner the Assessor’s decision. If you disagree with that determination, Larimer says you may continue to the County Board of Equalization (CBOE) (Larimer County Property Valuation Appeals).

What evidence helps

Start with sales that look like your home. The best sales are usually arm’s-length sales, meaning ordinary market transactions between unrelated parties where neither side was forced to act.

For an Actual value protest, organize each comparable sale with the sale date, property address, sale price, and a short explanation of why it is similar or different. Larimer’s recent protest form asks whether similar properties in the immediate neighborhood sold and provides lines for date sold, property address, and selling price (Larimer 2026 Real Property Protest Form).

Avoid relying on non-market transfers. The policy snapshot notes that foreclosure transfers to the lender generally do not prove market value, although a later resale of a foreclosure property may help if the condition and sale facts make it a normal market sale.

Also include evidence about your own property. Photos can show deferred maintenance, condition problems, or features that differ from the sales. A written estimate, appraisal, repair bid, or corrected property record can help the Assessor or board understand the issue more quickly.

If the case reaches CBOE, do not assume every earlier document automatically carries forward. The policy snapshot notes that evidence submitted to the Assessor does not automatically carry forward unless the petitioner identifies it for CBOE use. Keep a complete copy of your packet.

What the board can and cannot decide

Larimer’s first review is with the Larimer County Assessor. If you disagree with the Assessor’s Notice of Determination, Larimer County uses the County Board of Equalization (CBOE) process. Larimer says the Board of County Commissioners sits as the CBOE and appoints independent referees to hear taxpayer appeals of the Assessor’s valuation of real and personal property (Larimer County Property Valuation Appeals).

The CBOE can consider whether the Assessor’s valuation or classification should be changed under the rules that apply to the tax year. It can review evidence about comparable sales, property characteristics, and classification.

The CBOE does not set the mill levies that appear on your tax bill. Colorado explains that county commissioners, city councils, school boards, and special district boards set tax rates for their own taxing entities. The Assessor values property, but those taxing bodies decide the rates within the law (Colorado Division of Property Taxation).

If you are still dissatisfied after the CBOE decision, Larimer describes later options that may include the State Board of Assessment Appeals, district court, or arbitration, with deadlines measured from the CBOE decision letter. Those later steps are separate from the initial Assessor protest.

How TaxSauce helps

TaxSauce helps you slow the process down and organize it. We do not promise an outcome, and we do not tell the county what to decide.

We can help estimate whether an Actual value review may be worth your time, pull together comparable-sale evidence, flag possible property-record problems, and put the facts into a clear packet. The goal is to make your protest easier for the Assessor or CBOE to understand.

You stay in control. You review the evidence, decide what you agree with, and choose whether to file. If you file, you submit or authorize the filing using the county’s official options and deadlines.