2026 Property Tax Due Dates
Installment 1
February 28
First half (or full by April 30)
Installment 2
June 15
Second half
Penalty: 1% per month after due dateGrace period: None
Payment Methods
Online, Mail, In-Person
Costilla County Treasurer
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Costilla County Treasurer — P.O. Box 348, San Luis, CO 81152
In Person
Visit the Treasurer's office
Other Counties in Colorado
About Costilla County
Costilla County (Spanish for "rib") is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 3,499. The county seat is San Luis, the oldest continuously occupied town in Colorado.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.