Gas Prices in Great Falls, MT Today

Updated May 21, 2026 — Prices updated regularly from EIA data

$3.18

Average Regular Unleaded — Great Falls, Montana

Current Gas Prices in Great Falls

Great Falls, Montana gas prices are running $$3.18 per gallon this {month}. The local fuel market reflects Montana's {taxNote} tax rate alongside Great Falls's position in the regional supply chain.

Fuel TypePrice / GallonGradeTrend
Regular Unleaded$3.1887 octane▼ Falling
Mid-Grade$3.5989 octane▲ Rising
Premium$3.8691-93 octane▬ Stable
Diesel$3.96N/A▼ Falling

Price Comparison

Great Falls Average
$3.18
Regular Unleaded
Montana State Average
$3.22
$0.04 below the Montana average
National Average
$4.49
$1.31 below the national average

About Gas Prices in Great Falls

What makes Great Falls's gas market tick? Supply to Great Falls stations primarily flows through regional pipeline networks, keeping inventory stable but creating price sensitivity to any regional supply disruption. Seasonal demand peaks in summer and dips in winter, though Montana's climate moderates some of this variation.

Gas Prices by Brand in This City

Estimated prices based on brand modifiers. Sorted cheapest to most expensive.

CHEAPEST
Costco
$3.03
Speedway
$3.15
Circle K
$3.16
Sunoco
$3.19
Marathon
$3.20
BP
$3.22
Mobil
$3.23
Exxon
$3.24
Shell
$3.26
Chevron
$3.28

Fuel Type Prices in This City

Regular Unleaded
87 octane
Premium Gasoline
91-93 octane
Diesel Fuel
N/A

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Frequently Asked Questions

Each gallon of gas in Great Falls, Montana includes 18.4 cents in federal excise tax plus {tax} cents in Montana state fuel tax — a combined {totalTax} cents per gallon. On a 15-gallon fill-up, you pay ${taxTotal} in fuel taxes alone.
Today's average gas price in Great Falls is $$3.18 per gallon for regular unleaded. Premium is approximately ${premPrice} and diesel runs ${dslPrice}. Individual station prices vary by 15-25 cents across the metro area.
The cheapest gas in Great Falls is typically found at warehouse clubs (Costco, Sam's Club), high-volume discount chains like Circle K and Speedway, and stations in commercial strips with multiple competitors. Our brand comparison table shows current estimated prices by major brand in Great Falls.
Great Falls's current average of $$3.18 compares to the Montana statewide average of $$3.22. Great Falls is $0.04 below the Montana average the state average, which is typical for a metro of its size and location.
Gas stations in Great Falls typically update prices 1-3 times per week in response to wholesale market changes. Prices generally dip early in the week and rise Thursday-Sunday. Following weekly trends helps identify optimal fill-up windows.

Related Gas Price Pages

Gas Prices in MontanaCheapest Gas in Great FallsGas Prices Near Great FallsCompare All StatesRegular Unleaded in Great FallsPremium Gasoline in Great FallsDiesel Fuel in Great FallsShell - Great FallsExxon - Great FallsBP - Great FallsChevron - Great FallsMobil - Great Falls

More for Great Falls

Regular Gas Prices →Premium Gas Prices →Diesel Prices →Cheapest Gas →Gas Prices Nearby →Shell Prices →Exxon Prices →BP Prices →Chevron Prices →

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How to Find the Cheapest Gas Near YouRead guide →When Is Gas Cheapest? Best Days & TimesRead guide →How to Save Money on GasRead guide →
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