Montana uses the Rocky Mountain (PADD 4) weekly average from EIA, which does not publish an average for Montana itself. Regular averaged $4.42 a gallon there in the week of October 5, 2026, −6.9¢ on the week.
Regional figure, not a state average for Montana. EIA publishes weekly prices for nine states only. Montana is part of the Rocky Mountain (PADD 4) region, so the prices below are the Rocky Mountain (PADD 4) average, the same figure shown for 3 other states. Pump prices in Montana can differ from it.
Rocky Mountain (PADD 4) average, week of October 5, 2026
Regular$4.42/gal−6.9¢ vs last week+$1.35 vs a year ago
Midgrade$4.75/gal−6.1¢ vs last week+$1.36 vs a year ago
Premium$5.10/gal−7.9¢ vs last week+$1.39 vs a year ago
Diesel$6.27/gal−14.0¢ vs last week+$2.60 vs a year ago
US average regular: $4.35 (−11.1¢ on the week). The Rocky Mountain (PADD 4) average is 6¢ above it.
Regular per gallon, last 52 weeks: Rocky Mountain (PADD 4) vs USRocky Mountain (PADD 4)US average
Other states in the Rocky Mountain (PADD 4) region
Source: U.S. Energy Information Administration (EIA), weekly retail gasoline and diesel prices, week of October 5, 2026. Prices include taxes and are averages of a survey of stations, published every Monday (Tuesday after a federal holiday); a single station near you can be well above or below them. Via the Roadscore API.
