Gas prices in Idaho
EIA does not publish a weekly retail gasoline price for Idaho. The federal survey prices the district Idaho sits in, Rocky Mountain (PADD 4), at $4.27 per gallon in the week of August 31, 2026, 20 cents above the US average of $4.07. Pump prices inside the district vary around that figure.
On-highway diesel for Rocky Mountain (PADD 4) is $5.55, 4 cents below the US diesel average of $5.60. EIA runs the diesel survey for California and the regions only, so every other state carries its district figure here. Idaho's rack feeds from Salt Lake refining rather than the coast.
[EIA regional: Rocky Mountain (PADD 4)] Series EMM_EPMR_PTE_R40_DPG · State excise: 33.0 cents/gal · PADD 4
Idaho's pump-price cost stack
Every gallon breaks down into five named slices. Applying the shares to the $4.27 figure above, and to Idaho's own excise rate, the stack looks like this:
Crude / refining / distribution shares estimated from EIA Petroleum Marketing Monthly. Federal excise from FHWA Highway Statistics. State excise from the API Motor Fuel Tax Map and Tax Foundation 2026. [EIA · 31 Aug 2026] [API · 31 Aug 2026]
Border-state comparison
How the neighbours read in the same survey week. Neighbours inside the same EIA district carry the same published figure, which is why several rows can match exactly.
Use the border comparator to compute the per-tank difference where the two states fall in different EIA districts.
Metro-level EIA series for Idaho
EIA publishes no metro-level retail series inside Idaho. Its ten metro series cover Boston, New York City, Miami, Cleveland, Chicago, Houston, Denver, Los Angeles, San Francisco and Seattle. We do not have a sourced within-state breakdown for Idaho and are not going to estimate one.
FAQ
What is the current average price of regular gas in Idaho?
EIA does not publish a weekly retail gasoline price for Idaho. The federal survey prices the district Idaho sits in, Rocky Mountain (PADD 4), at $4.27 per gallon in the week of August 31, 2026, 20 cents above the US average of $4.07. Pump prices inside the district vary around that figure. [EIA regional: Rocky Mountain (PADD 4)]
Does EIA publish a price for Idaho?
No. EIA prices the US, the five PADDs, three PADD 1 sub-districts, West Coast less California, ten metro areas and nine states. Idaho is not among them, so this page shows Rocky Mountain (PADD 4) and labels it.
What is Idaho's state gas tax?
33.0 cents per gallon state excise, plus the 18.4 cents federal excise. [API · 31 Aug 2026]