Colorado county assessors revalue property on a two-year cycle. If your vacant land assessment jumped this cycle, you have a short window to fight it — and most landowners miss it because they don't know the deadline. Under C.R.S. § 39-5-122, Notices of Valuation go out by May 1. You have until June 1 to file a protest with the assessor. Miss that and you're stuck with the new number for two years. Call 970-478-1022 — we buy Colorado land as-is. If the tax bill makes your land more of a burden than an asset, we can close in two weeks.
Colorado assessors use a mass appraisal process to value every parcel in the county. For vacant land, the primary method is comparable sales — recent arm's-length sales of similar parcels in the same area. The assessor is not appraising your specific parcel in detail; they're applying market data to groups of properties with similar characteristics.
Under C.R.S. § 39-1-104.2, vacant land carries an assessment rate of 29% for commercial-use vacant land and 27.9% for most other vacant land. Residential-classified land is assessed at 6.7%. The distinction matters enormously: a parcel assessed at 27.9% of its actual value has a tax base almost four times higher than the same parcel classified as residential.
Many rural Colorado landowners don't realize their vacant 5-acre parcels near subdivisions are classified as "vacant land" at the higher rate rather than "residential land." If your parcel is zoned residential and surrounded by residential uses, you may have grounds to request a reclassification — which is a separate process from a value appeal but can result in a dramatically lower tax bill.
Colorado's two-year assessment cycle means reappraisal happens in odd years (values set for the upcoming two-year period). In non-reappraisal years, the assessor can only adjust a value if a specific event occurred — sale, subdivision, improvement, or correction of an error. You can still appeal in non-reappraisal years, but your basis for appeal is narrower.
Under C.R.S. § 39-5-122, the county assessor must mail a Notice of Valuation (NOV) by May 1 of the reappraisal year. The NOV states the assessor's estimate of your land's actual value and the applicable assessment rate. Your property tax bill comes later — the mill levy is set by the taxing authorities in the fall. You can't appeal the mill levy; you can only appeal the actual value on the NOV.
Under C.R.S. § 39-3-118.7, certain land preservation and open space designations may qualify for property tax exemptions or deferrals. Colorado also has exemptions for land subject to a recorded conservation easement — the easement's restrictions reduce market value, which should reduce assessed value. If your land is under easement and the assessor isn't reflecting the restriction, that's a strong appeal argument.
Colorado has a four-level appeal process. Most cases resolve at the first two levels — the assessor protest and the Board of Equalization. The higher levels exist for serious disputes.
Under C.R.S. § 39-5-122, your first step is a protest filed directly with the county assessor by June 1. The protest can be filed in person, by mail, or online — most counties now accept online protests through their assessor's portal. Your protest should state specifically why you believe the value is wrong and provide supporting evidence.
Evidence that works:
The assessor has until June 15 to issue a written determination on your protest. If you're satisfied, you're done. If not, you move to Level 2.
Under C.R.S. § 39-8-101 et seq., you can appeal the assessor's determination to the county Board of Equalization. The BOE consists of the county commissioners sitting as a quasi-judicial body. You must file your BOE appeal by July 15 (or as stated on your assessor's determination). The BOE schedules a hearing and issues a written decision. Most appeals that survive to the BOE are resolved here.
If the BOE rules against you, you can appeal to the state Board of Assessment Appeals within 30 days of the BOE decision. The BAA is an independent state agency — not the assessor's office — so you get a fresh look. BAA hearings are more formal: sworn testimony, exhibits, and written briefs. The BAA hears cases from all 64 Colorado counties. Success rates improve significantly when you have a qualified appraisal supporting your position.
Lose at the BAA? You can appeal to the Colorado district court within 49 days under C.R.S. § 39-8-108. District court is full judicial review, typically requiring an attorney. Rarely worth pursuing unless the assessed value — and thus the tax at stake — is very large.
Missed the June 1 protest deadline? You can still file an abatement petition directly with the assessor under C.R.S. § 39-10-114. An abatement can correct clear errors — wrong acreage, property that was double-assessed, etc. — but it's harder to get a value reduction through abatement than through the normal protest process. File promptly; the assessor has discretion to grant or deny.
Keep your Notice of Valuation. Keep your protest filings. These documents are needed for every subsequent appeal level. See our full Colorado property tax guide for how taxes are calculated once the value is set.
In high-growth Front Range counties — Larimer, Weld, El Paso — assessed values on vacant land jumped 20–40% in the 2023 reappraisal cycle due to rapid sales price appreciation from 2021–2022. Many landowners who protested successfully submitted comparable sales from late 2022 and 2023 when the market cooled — showing that the assessor's value was based on peak-market comps that didn't reflect conditions at the January 1, 2023 assessment date.
In Southern Colorado — Pueblo, Huerfano, Las Animas — the appeal process at the county BOE is often informal and accessible without an attorney. Bring three comparable sales, show up to your hearing, and explain your case clearly. These counties see far fewer BOE appeals than Front Range counties, and assessors are often willing to adjust.
In resort counties — Routt (Steamboat Springs), Pitkin (Aspen), Summit — values are extremely high and the stakes are large. BOE and BAA appeals here frequently involve licensed appraisers and attorneys. The cost of a $2,000 appraisal is worth it when you're contesting a $50,000+ assessed value differential.
See also: Colorado vacant land property tax guide, selling low-value rural land, and avoid tax lien foreclosure on your land.
Get answers to common questions about selling your land
Under C.R.S. § 39-5-122, you must file your protest with the county assessor by June 1 of the reappraisal year. The assessor mails Notices of Valuation by May 1. Missing the June 1 deadline waives your right to the standard appeal process. You can still file an abatement petition under C.R.S. § 39-10-114 for clear factual errors, but value appeals require the June 1 protest.
Under C.R.S. § 39-1-104.2, most vacant land is assessed at 27.9% of actual value (2026 figures). Commercial-use vacant land is assessed at 29%. Residential land — parcels zoned and used for residential purposes — is assessed at only 6.7%. If your parcel is classified incorrectly, a reclassification request can dramatically reduce your tax bill, independent of a value appeal.
The strongest evidence is arm's-length sales of comparable parcels within 12–18 months of the January 1 assessment date, ideally in the same county and with similar size, access, zoning, and topography. A written appraisal from a Colorado-licensed appraiser under C.R.S. § 12-10-601 carries significant weight at the Board of Equalization and Board of Assessment Appeals levels.
The BAA is a state-level independent board that hears property valuation appeals after the county Board of Equalization has ruled. Under C.R.S. § 39-8-101 et seq., you must appeal to the BAA within 30 days of the BOE decision. The BAA holds formal hearings with sworn testimony and written briefs. It's the last administrative level before district court.
Yes. If you've already paid taxes based on the higher assessment and your appeal reduces the value, you're entitled to a refund of the overpaid taxes plus interest. The refund process runs through the county treasurer's office. Make sure to pay your current tax bill while the appeal is pending — non-payment creates a separate lien problem regardless of your appeal status.
It should. A recorded conservation easement restricts land use in perpetuity under C.R.S. § 38-30.5-101 et seq., which reduces market value. If the assessor's value doesn't reflect the easement's restrictions, that's strong grounds for appeal. Provide the recorded easement document and a qualified appraisal showing the before-and-after value impact. Some easement-encumbered land also qualifies for exemptions under C.R.S. § 39-3-118.7.
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