Petroleum County, Montana Property Taxes

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Property Taxes in Petroleum County, Montana

Median Petroleum County effective property tax rate: 1.11%, significantly higher than the national median of 1.02%.
Median Petroleum County home value: $58,246
Median annual Petroleum County tax bill: $664, $1,736 lower than the national median property tax bill of $2,400.

How are property taxes in Petroleum County calculated?

Property taxes in Petroleum County are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding your county's property tax system, exemptions, and reduction opportunities can lead to significant savings. Whether you live in Petroleum County or another part of Petroleum County, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Petroleum County, Montana Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.11%

Estimate Property Tax Bill

$647

$600

How Does the Petroleum County Property Tax Calculator Work?

Use this Petroleum County property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Petroleum County's median effective tax rate of 1.11% to generate your estimate.

Enter your property's estimated assessed value — the figure the assessment authority assigns for tax purposes, which is typically lower than market value after applicable exemptions. Our calculator uses the median effective rate for a more accurate estimate than the statutory millage rate alone.

Your actual bill may vary based on your specific exemptions, local school district levies, and any special assessment districts that apply to your property. Petroleum County's median tax rate is higher than Montana's 0.78% median rate, while the county's median tax bill of $664 is lower than the national median property tax bill of $2,400.

For a more precise estimate, scroll down to explore city and ZIP code-level tax rate trends across Petroleum County.

Property Tax Rates Across Petroleum County, Montana

What Are Effective Property Tax Rates Across Petroleum County?

Local government entities set tax rates, which vary widely across Petroleum County. Each year, the county estimates its budget for public services and divides that total by the assessed value of all taxable property within its jurisdiction.

Below, compare Petroleum County's effective property tax rate to other counties in Montana or the U.S. median of 1.02%.

Petroleum County's median effective rate stands at 1.11%, which is higher than the national median of 1.02%. Within Petroleum County, the highest rate is found in Winnett at 1.11%, while Winnett has the lowest at 1.11%.

These variations reflect differences in local school district levies, special assessment districts assessments, and special district bonds — which compound the base county rate.

Property Tax Rates Across Petroleum County, Montana

Source: Ownwell

1.11%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Petroleum County Tax Rate

1.11%

Median Effective Montana Tax Rate

0.78%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Petroleum County, Montana

City	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
Winnett	0.90%	0.93%	1.11%	1.12%	1.12%
Cat Creek	N/A	N/A	N/A	N/A	N/A
Grass Range	N/A	N/A	N/A	N/A	N/A
Mosby	N/A	N/A	N/A	N/A	N/A
Teigen	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Assessment Values Across Petroleum County, Montana

When examining property taxes in Petroleum County, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Petroleum County Montana Department of Revenue estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In Petroleum County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of July.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Petroleum County.

For example, the median tax bill in Petroleum County is $664, with tax bills ranging significantly across the county. Winnett has the highest median home price at $56,415.

Property Tax Assessment Values Across Petroleum County, Montana

Source: Ownwell

$56,415

Median Petroleum County Market Value

$58,246

Median Montana Market Value

$317,000

Median United States Market Value

$235,294

Property Tax Assessment Values Across Petroleum County, Montana

City	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
Winnett	$7,437	$19,030	$56,415	$161,374	$296,119
Cat Creek	N/A	N/A	N/A	N/A	N/A
Grass Range	N/A	N/A	N/A	N/A	N/A
Mosby	N/A	N/A	N/A	N/A	N/A
Teigen	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Bills Across Petroleum County, Montana

Property tax bills in Petroleum County are calculated by applying the local tax rate to a home’s assessed value, which is based on the market value of the property. The county’s median home price is $58,246, so even modest changes in assessed value can affect what a homeowner owes each year.

Several factors can influence the final bill, including the property’s location, the value assigned by local assessors, and any local taxing districts that apply. In Petroleum County, tax bills vary widely: the 25th percentile is $264, the 75th percentile is $1,776, and the 90th percentile reaches $3,344. Winnett has the highest and lowest median tax bill at $633, showing how limited local variation can still shape what homeowners pay.

For homeowners, this means property taxes are not a fixed amount. A higher assessed value usually leads to a higher bill, while a lower assessment can reduce the amount due.

Property Tax Bills Across Petroleum County, Montana

Source: Ownwell

$633

Median Petroleum County Tax Bill

$664

Median Montana Tax Bill

$2,559

Median United States Tax Bill

$2,400

Property Tax Bills Across Petroleum County, Montana

City	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
Winnett	$86	$236	$633	$1,697	$3,048
Cat Creek	N/A	N/A	N/A	N/A	N/A
Grass Range	N/A	N/A	N/A	N/A	N/A
Mosby	N/A	N/A	N/A	N/A	N/A
Teigen	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	June 1

Links
Petroleum Tax Assessor
Website	svc.mt.gov

Frequently Asked Property Tax Questions in Petroleum County, Montana

How are property taxes calculated in Petroleum County, Montana?

Property taxes in Petroleum County, Montana are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.

How do I appeal my property taxes in Petroleum County, Montana?

To appeal your property taxes in Petroleum County, Montana, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.

What property tax exemptions are available in Petroleum County, Montana?

Common property tax exemptions in Petroleum County, Montana include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.

When are property taxes due in Petroleum County, Montana?

Property tax deadlines in Petroleum County, Montana vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.

How can Ownwell help reduce my property taxes in Petroleum County, Montana?

Ownwell provides professional property tax appeal services in Petroleum County, Montana. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.