Average gasoline prices in Montana have risen 10.3 cents per gallon in the last week, averaging $3.26/g on Monday, March 4, according to GasBuddy’s survey of 615 stations in Montana. Prices in Montana are 39.6 cents per gallon higher than a month ago and stand unchanged compared to a year ago. The national average price of diesel has fallen 2.7 cents in the last week and stands at $4.03 per gallon.