Idaho gas prices
Idaho sits in PADD 4, the Rocky Mountain petroleum district, which is the smallest and most isolated refining region in the country. The state has no refineries of its own and depends on fuel shipped in from refineries in Montana, Utah, and Washington. Pipeline capacity into the region is limited, and when demand spikes or a refinery goes down for maintenance, prices in Idaho can jump quickly because there is not much slack in the supply chain.
The state's rural geography adds to fuel costs. Idaho covers a large area with a relatively small population, meaning fuel has to travel long distances by truck to reach stations in smaller communities. Boise and the Treasure Valley benefit from somewhat better supply access, but prices in northern Idaho and the eastern part of the state tend to run higher due to transportation costs and fewer competing stations.
Idaho's gas tax sits in the moderate range nationally, so taxes are not the primary driver of price differences. The bigger factor is simply the constraint of being in a landlocked region with limited refinery access. Diesel is particularly important in Idaho given the state's large agricultural sector and the truck traffic moving goods along the I-84 and I-15 corridors.
Price history
Why are Idaho gas prices sometimes higher than neighboring states?
Idaho has no refineries and relies on fuel piped or trucked in from Montana, Utah, and Washington. The Rocky Mountain region (PADD 4) has limited refining capacity and pipeline infrastructure, so any supply disruption can cause prices to rise faster and stay elevated longer than in better-connected regions.
What affects diesel prices in Idaho?
Diesel demand in Idaho is driven by agriculture, logging, and the heavy truck traffic along major interstate corridors. Because supply into the PADD 4 region is constrained, diesel prices can be more volatile than in regions with direct refinery access. Seasonal demand during harvest and planting also plays a role.
How do Boise gas prices compare to rural Idaho?
Boise and the Treasure Valley generally have lower prices due to better pipeline access and more competition among stations. Rural areas in northern and eastern Idaho often pay more because fuel must be trucked greater distances and there are fewer stations competing for business.