Missoula, MT (KGVO-AM News) - After dropping seven weeks in a row, Montana gas prices have taken a significant jump in back-to-back weeks. “Average gasoline prices in Montana have risen 17.3 cents per gallon in the last week, averaging $4.30 per gallon today,” De Haan said. “Prices in Montana are 38.6 cents per gallon higher than a month ago and stand $1.06 cents per gallon higher than a year ago." “The national average is up 23.9 cents per gallon from a month ago and stands 95.6 cents per gallon higher than a year ago. READ MORE: Montana Gas Prices Drop For Six Straight Weeks After Record HighsDe Haan said average gas and diesel prices rose in nearly every state over the last week.