2026 Property Tax Due Dates
County-specificNovember 30
First installment due
May 31
Second installment due (following year)
Big Horn County Treasurer
Treasurer
Denise Rios
Phone
406-665-9830Fax
406-665-9838
Mailing Address
PO Box 908
Hardin, MT 59034
Office Hours
How to Pay
Online
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By Mail
Mail check payable to Big Horn County Treasurer — PO Box 908, Hardin MT 59034
In Person
Visit the Treasurer's office — 121 W 3rd, Room 204, Second Floor, Hardin MT 59034, Monday through Friday 8am to 5pm
About Property Taxes in Montana
Montana property taxes are administered at the county level. The state Department of Revenue appraises property at market value and applies a class rate to determine the taxable value. Residential property is appraised at market value, and the taxable value equals a percentage of that (the residential class rate is set by the state legislature and has been reduced in recent years to around 1.35% of market value — meaning a $300,000 home has a taxable value of approximately $4,050). Montana has no sales tax, so property taxes are an important revenue source for local governments and schools. Tax bills are mailed in the fall and split into two payments.
Payment & Assessment
Montana property taxes are paid in two equal installments: First half: Due November 30 Second half: Due May 31 of the following year A 2% penalty per month (up to 10%) applies to late payments. Most counties offer online payment through the county treasurer's website. Contact your county treasurer for available payment options.
Statewide framework for Montana. Your county's specific rates and deadlines are shown above.
Other Counties in Montana
About Big Horn County
Big Horn County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 13,124. The county seat is Hardin. The county, like the river and the mountain range, is named after the bighorn sheep in the Rocky Mountains. The county was founded in 1913.
Source: Wikipedia — content available under CC BY-SA 4.0
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.