Rocky Mountain region
Rocky Mountain Diesel Prices Today
The average diesel price in the Rocky Mountain region, how it compares with the U.S. average, and the 12-month trend.
Week of October 12, 2026
$6.30per gallon
Source: U.S. Energy Information Administration (EIA), weekly retail on-highway diesel price, published Mondays.
What is the average diesel price in Rocky Mountain today?
The average retail diesel price in the Rocky Mountain region is $6.30 per gallon for the week of October 12, 2026, up 3 cents from last week and 72% above a year ago. That is 12 cents above the U.S. average of $6.18, according to EIA, the U.S. Energy Information Administration.
Week of October 12, 2026. Source: EIA weekly retail on-highway diesel price.
Rocky Mountain diesel price, last 12 months
Weekly, dollars per gallon. The U.S. average this week is $6.18. Source: EIA.
States in the Rocky Mountain region
Compare with other regions
Rocky Mountain
5 states
$6.30/gal
12 cents above U.S. average
Last 26 weeks
New England
6 states
$6.44/gal
26 cents above U.S. average
Last 26 weeks
Central Atlantic
6 states
$6.47/gal
29 cents above U.S. average
Last 26 weeks
Lower Atlantic
6 states
$5.64/gal
53 cents below U.S. average
Last 26 weeks
Midwest
15 states
$6.26/gal
8 cents above U.S. average
Last 26 weeks
Gulf Coast
6 states
$5.81/gal
37 cents below U.S. average
Last 26 weeks
West Coast
7 states
$7.24/gal
$1.06 above U.S. average
Last 26 weeks
California
State
$8.09/gal
$1.91 above U.S. average
Last 26 weeks
Diesel tax by state
Part of every gallon is tax. See the state diesel tax for the states in the Rocky Mountain region and every other state, ranked from highest to lowest, in our diesel tax by state table.
Free tools that use these prices
Fuel surcharge calculator
Work out your surcharge from this week's price.
Open toolToll and route planner
See the diesel price in every state on your route, plus truck stops.
Open toolCost per mile calculator
See what fuel does to your cost per mile and break-even rate.
Open toolIFTA tax calculator
Figure your quarterly fuel tax by state.
Open toolRocky Mountain diesel price questions
Short answers about this region's diesel price.
The average retail diesel price in the Rocky Mountain region is $6.30 per gallon for the week of October 12, 2026, up 3 cents from last week and 72% above a year ago. That is 12 cents above the national average of $6.18. The source is EIA, the U.S. Energy Information Administration.
EIA counts these states in the Rocky Mountain region: CO, ID, MT, UT, WY. EIA does not publish a separate diesel price for each state, so drivers in these states use the regional average as a guide.
This is an average across many stations for the week. The price at one pump depends on the brand, the exact location, state and local taxes, and whether you use a fuel card discount. Use it as a guide for planning, then compare stops on your route.
How to read these numbers
Prices are the U.S. Energy Information Administration's weekly retail on-highway diesel prices, published on Mondays (latest: October 12, 2026). We show them unchanged. They are averages, not the price at one pump. EIA publishes the national average, seven regions and California only, so a state that is not California uses its region's average. This page refreshes every day.
Source: EIA Gasoline and Diesel Fuel Update.