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Updated 2025 Tax Year

Alamosa County
Property Tax Guide

Everything you need to know about property taxes in Alamosa County, CO. Rates, due dates, exemptions, and how it affects your monthly payment.

8 Official Sources
8 min read
Quick Facts
Tax Rate
0.73997% effective rate for 2025 (varies by taxing districts within county)
1st Due
Feb 28
2nd Due
Jun 15
Exemptions
5+ Available
Section 1

How Property Tax Works

Alamosa County operates under Colorado's property tax system, which funds essential local services including schools, roads, fire protection, and county operations. The county's effective property tax rate for the 2025 tax year is approximately 0.73997%, which is below the state average and reflects recent legislative adjustments under SB 24-233. With an average home value of $206,253 in 2023, Alamosa County offers relatively affordable property taxes compared to Colorado's Front Range counties.

Property tax rates vary significantly by location within Alamosa County due to special taxing districts such as school districts, fire protection districts, water districts, and metropolitan districts. Your exact tax rate depends on which combination of these districts serve your property. All property owners receive a detailed tax statement showing each taxing entity and their individual mill levies, allowing you to see exactly how your tax dollars are allocated across different local services.

Section 2

What Makes Up Your Tax Bill

ComponentRate (Mills)Description
County General~15.5County operations, roads, sheriff, courts
School District~35.2Local school district operations and bonds
State Education~5.4Statewide school funding
Fire Protection~8.6Fire district services (varies by district)
Water Districts~3.2Water and sewer services (if applicable)
Library District~2.1Public library services
Other Special DistrictsVariesRecreation, metropolitan, improvement districts
Total Average73.997Equivalent to 0.73997%

Note: Rates shown are approximations for FY 2025-2026. Your actual rate depends on the specific combination of taxing districts serving your property location. Under Colorado's new dual assessment system beginning in 2025, residential properties have different assessed values for school district taxes versus other local government taxes.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in Alamosa County, property taxes are due in two installments:

First Installment
Feb 28
Delinquent after Dec 10
Second Installment
Jun 15
Delinquent after Apr 10
Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in Alamosa County are triggered by changes in property ownership, new construction, or improvements that increase a property's assessed value during the tax year. When these events occur, the county assessor calculates the difference between the old and new assessed values and applies the current tax rate to determine additional taxes owed.

For example, if you complete a $50,000 home addition in March and your property's assessed value increases by $3,200 (at Colorado's 6.4% residential assessment rate for non-school taxes), you would owe supplemental taxes on that $3,200 increase prorated from the completion date through the end of the tax year. At Alamosa County's 0.74% rate, this would result in approximately $18 in additional taxes, prorated for the remaining months of the tax year.

Example Calculation

$300,000 Home

  • Market Value: $300,000
  • Assessed Value: $19,200 (6.4% for local taxes)
  • Less: Senior Credit (if applicable): -$1,920
  • Net Taxable Value: $17,280
  • Annual Tax: $128 (0.74% rate)
  • Monthly Payment: $11

$600,000 Home

  • Market Value: $600,000
  • Assessed Value: $38,400 (6.4% for local taxes)
  • Less: Homestead Credit (assessment growth cap): -$2,400
  • Net Taxable Value: $36,000
  • Annual Tax: $266
  • Monthly Payment: $22

$1,000,000 Home

  • Market Value: $1,000,000
  • Assessed Value: $64,000 (6.4% for local taxes)
  • Less: Disabled Veteran Credit (if applicable): -$3,360
  • Net Taxable Value: $60,640
  • Annual Tax: $449
  • Monthly Payment: $37

Note: All credits require application and approval. School district taxes calculated separately under Colorado's dual assessment system.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in Alamosa County require borrowers to maintain an escrow account for property taxes, especially when the loan-to-value ratio exceeds 80%. Your lender collects monthly tax payments as part of your mortgage payment and remits taxes directly to the Alamosa County Treasurer when due. Property taxes in Alamosa County are typically due in two installments, and your lender will receive tax statements directly from the county.

It's important to verify that your lender pays your taxes on time, as you remain ultimately responsible for payment even when using escrow. You can check payment status through the Alamosa County Treasurer's online system or by calling (719) 589-6365. If you pay off your mortgage or refinance, ensure there's no gap in tax payment responsibility and that any escrow surplus is properly transferred or refunded.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

Q: When are property taxes due in Alamosa County? A: Property taxes are typically due in two installments during the current fiscal year. Contact the Alamosa County Treasurer at (719) 589-6365 for specific 2025 due dates, as they can vary slightly each year.

Q: What tax credits are available and how do I apply? A: Alamosa County offers several tax credits including the Senior Property Tax Credit, Disabled Veteran Property Tax Credit, and Homestead Credit. All credits require annual application through the county assessor's office and are NOT automatic. Application deadlines are typically in early February.

Q: How does the Homestead Credit work? A: The Homestead Credit doesn't reduce your home's market value but caps the annual increase in your property's assessed value for tax purposes. You must file annually with the assessor's office to maintain this benefit, and it only applies to your primary residence.

Q: How often are properties assessed? A: Colorado law requires property reassessment every two years on odd-numbered years (2025, 2027, etc.). However, the assessor may adjust values annually based on market conditions or property improvements.

Q: What if I disagree with my property's assessed value? A: You can protest your assessment during the protest period, typically May 1-June 8. Contact the Alamosa County Assessor's office for forms and procedures. If unsatisfied, you can appeal to the county board of equalization.

Q: What are the penalties for late payment? A: Late payments incur interest and penalties that accrue monthly. Contact the Alamosa County Treasurer at (719) 589-6365 for current penalty rates and payment options if you're behind on taxes.

Q: Can I pay my property taxes online? A: Yes, Alamosa County typically offers online payment options through their official website. Contact the treasurer's office for the secure payment portal and accepted payment methods.

Q: Why did my tax rate change from last year? A: Tax rates can change due to new voter-approved bonds, changes in special district boundaries, or adjustments by local taxing entities. Beginning in 2025, Colorado's new dual assessment system may also affect how your taxes are calculated.

Q: Do I need to report home improvements to the assessor? A: Yes, improvements that add value to your property should be reported to ensure accurate assessment. This includes additions, major renovations, or new structures. The assessor may also discover improvements through periodic inspections.

Q: What happens if I don't pay my property taxes? A: Unpaid taxes result in a tax lien against your property. After three years of delinquency, the county may sell your property at a tax sale to recover unpaid taxes, interest, and fees.

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