Gasoline prices across Idaho decreased by four cents this week, bringing the state average down to $4.95 per gallon for regular unleaded fuel, according to data released by AAA Idaho on October 5, 2026. Despite this slight relief at the pump, Idaho maintains its position as the seventh most expensive state for fuel nationwide.
The recent minor decline offers a small break for drivers, but prices remain significantly elevated compared to previous months and years. The current state average sits 33 cents higher than it was a month ago and stands $1.48 above the average recorded during the same period last year.
City-by-City Breakdown Across Idaho
Fuel costs vary significantly depending on the municipality, with southern and eastern regions of the state continuing to experience the highest averages:
- Twin Falls: $5.05 per gallon
- Pocatello: $5.04 per gallon
- Boise: $5.03 per gallon
- Idaho Falls: $4.92 per gallon
- Franklin: $4.90 per gallon
- Lewiston: $4.56 per gallon
- Coeur d’Alene: $4.55 per gallon
National Trends and Comparisons
Nationwide, pump prices experienced a sharper decline this week. The national average dropped 11 cents to settle at $4.36 per gallon. However, similar to Idaho’s trajectory, national figures remain higher over the medium and long term. They sit 22 cents higher than a month ago and $1.23 higher than a year ago.
Across the country, price disparities remain wide. California continues to record the nation’s highest regular gasoline prices at $6.39 per gallon, while Indiana registers the cheapest fuel in the country at $3.74 per gallon.
Factors Driving Idaho Fuel Prices
Idaho falls within the U.S. Energy Information Administration’s PADD 4 (Rocky Mountain) region. Gasoline pricing in this geographic sector is typically influenced by several key factors:
- Proximity to regional refineries and crude oil distribution networks.
- Local state excise taxes, sales taxes, and municipal fees.
- Regional supply and demand dynamics unique to the Rocky Mountain states.
- Seasonal shifts in fuel blend requirements.
