Gas Prices Increase By 8.6 Cents During Week
Average gasoline prices in Montana have risen 8.6 cents per gallon in the last week, averaging $4.31/g on Monday, Aug. 17, according to GasBuddy’s survey of 615 stations in Montana. Prices in Montana are 22.6 cents per gallon higher than a month ago and stand $1.08/g higher than a year ago. The national average price of diesel has increased 14.3 cents compared to a week ago and stands at $5.418 per gallon.
According to GasBuddy, the cheapest station in Montana was priced at $3.99/g on Sunday, Aug. 16, while the most expensive was $5.09/g, a difference of $1.10/g.
The national average price of gasoline has risen 7.7 cents per gallon in the last week, averaging $4.02/g on Monday. The national average is up 3.6 cents per gallon from a month ago and stands 93.1 cents per gallon higher than a year ago, according to GasBuddy data compiled from more than 11 million weekly price reports.
Historical gasoline prices in Montana and the national average going back five years: Aug. 17, 2025: $3.23/g (U.S. Average: $3.09/g) Aug. 17, 2024: $3.47/g (U.S. Average: $3.39/g) Aug. 17, 2023: $3.99/g (U.S. Average: $3.85/g) Aug. 17, 2022: $4.21/g (U.S. Average: $3.91/g) Aug. 17, 2021: $3.31/g (U.S. Average: $3.17/g) “Average gasoline prices climbed back above $4 per gallon over the last week, with prices rising in slightly more states than they fell, as rebounding oil prices driven by the continued closure of the Strait of Hormuz and ongoing Ukrainian attacks on Russian oil refineries kept upward pressure on the market,” said Patrick De Haan, head of petroleum analysis at GasBuddy. “Diesel felt the pressure even more acutely, rising in all but a few states, as Ukraine’s attacks on Russian refining infrastructure continue to impact refined product prices more than crude oil itself. While the seasonal transition to cheaper winter- blend gasoline in the coming month could bring some relief, the two dominant challenges facing motorists — the closed Strait and the ongoing refinery strikes — show no signs of resolving anytime soon. Until they do, the path for gas and diesel prices remains tilted to the upside.”
