Updated April 5, 2026 — Prices updated regularly from EIA data
$3.22
Average regular unleaded — Montana
Today's Montana Gas Prices
At $$3.22 per gallon, Montana fuel costs are below ($0.77) the national average of ${natAvg}. Motorists in Montana benefit from {supplyNote}, which helps state fuel tax of 33 cents per gallon offset the state's {tax}-cent per gallon fuel tax.
Many states require reformulated gasoline (RFG) or special summer blends to meet EPA air quality standards during warmer months. These blends reduce evaporative emissions but cost 5-15 cents more per gallon to produce.
Costco consistently offers the cheapest gas in any Montana market where it operates — typically 15-20 cents below local street prices. Circle K, Speedway, and QuikTrip (where available) also routinely undercut the market average. Premium brands like Shell, Chevron, and BP typically price above the local average.
For a standard sedan with a 13-gallon tank, a fill-up in Montana at today's $$3.22 average costs approximately ${fillCost}. A full-size truck or SUV with an 18-22 gallon tank runs ${truckFillLow} to ${truckFillHigh} to fill.
Gas price trends in Montana follow national crude oil market movements combined with regional refinery and supply factors. Seasonal patterns typically see prices rise in spring (summer blend transition) and ease in fall and winter.
Four main factors drive Montana gas prices: crude oil cost (50-60% of the price), state and federal fuel taxes (33 cents + 18.4 cents federal), refining and distribution costs, and retail station margins. Crude oil price swings cause the most dramatic short-term changes.
