Oregon’s transportation economy is absorbing another sharp increase in diesel costs, placing considerably more expensive fuel into the tanks of commercial trucks, farm machinery, construction equipment and diesel vehicles at a time when the movement of goods remains inseparable from the state’s broader cost of doing business.
The statewide average for diesel reached $6.261 per gallon Tuesday, September 8, climbing from $5.878 one week earlier and $5.502 a month ago. A year ago, Oregon diesel averaged $4.475 per gallon. The difference amounts to nearly $1.79 per gallon over 12 months, an increase of approximately 40 percent.
Southern Oregon is carrying some of the highest prices in the state. Diesel in Grants Pass averaged $6.382 Tuesday, compared with $5.586 a month earlier and $4.531 a year ago. The Medford Ashland market stood at $6.430, up from $5.553 last month and $4.550 one year earlier. Eugene Springfield averaged $6.306, Bend stood at $6.296 and Pendleton reached $6.281.
The escalation has developed with unusual speed. Oregon’s statewide diesel average has increased approximately 76 cents per gallon in one month. Grants Pass has experienced an increase approaching 80 cents during the same period, while Medford Ashland has climbed approximately 88 cents.
Those increases are entering an Oregon economy that depends extensively upon diesel transportation. Interstate 5 serves as the principal north south commercial corridor through western Oregon, connecting Southern Oregon with the Willamette Valley, Portland, California and the interstate freight network. Interstate 84 performs a similarly important function across northern and eastern Oregon. Trucks traveling those corridors carry groceries, construction materials, machinery, agricultural commodities, timber products, manufactured goods and merchandise destined for communities throughout the state.
For commercial carriers, the mathematics become substantial long before diesel reaches the consumer.
A 150 gallon purchase at the current Grants Pass average costs approximately $957. At the local average recorded one year ago, the same amount of diesel would have cost about $680. The difference is approximately $277 for one purchase of 150 gallons.
Commercial trucks consuming thousands of gallons over the course of regular operations multiply that difference rapidly. Fuel represents one of the major variable expenses in trucking, and sustained increases can be incorporated into freight rates and fuel surcharges. Those transportation expenses can subsequently become part of the delivered cost of commodities moving through warehouses, distribution centers, retailers and other businesses.
The consequences are not confined to long haul trucking. Oregon agriculture relies upon diesel for tractors, harvesting equipment, irrigation operations and transportation of crops and livestock. Timber and forestry operations use diesel powered machinery in environments where alternative power sources are often impractical. Construction companies operate excavators, loaders, generators and heavy trucks. Local delivery fleets, excavation companies and numerous independent contractors encounter the same underlying fuel expense on a smaller scale.
Federal petroleum data show that Oregon is participating in a much larger West Coast diesel market experiencing exceptional price pressure. For the week ending August 31, the U.S. Energy Information Administration placed the national on highway diesel average at $5.599 per gallon. The West Coast average was substantially higher at $6.497.
That federal measurement placed West Coast diesel approximately $2.01 per gallon above its level one year earlier. Excluding California, the regional average was $5.872. California stood at $7.218, demonstrating the pronounced regional disparity between western fuel markets and much of the remainder of the country.
International petroleum conditions are an important component of the increase. Crude oil markets and refined petroleum products have faced volatility associated with geopolitical conflict, uncertainty involving petroleum shipments through the Strait of Hormuz and disruptions affecting refining and petroleum infrastructure overseas. Diesel is particularly sensitive to constraints in the global market for distillate fuels because the same general petroleum category supports freight transportation, industrial activity, agriculture and other energy intensive operations around the world.
The Strait of Hormuz occupies an especially important position in international petroleum commerce because a substantial portion of global oil consumption moves through the narrow shipping corridor connecting the Persian Gulf with the Gulf of Oman. Disruption, reduced tanker traffic or the prospect of prolonged instability can affect crude oil pricing well beyond the Middle East, eventually reaching refineries, wholesale fuel markets and retail stations thousands of miles away.
Oregon’s own fuel cost structure also contributes to what motorists ultimately pay, although state taxes do not account for the rapid increase recorded during the past month. Oregon imposes a 40 cent per gallon state use fuel tax on petroleum diesel, biodiesel and renewable diesel. That statewide rate has been in effect since January 2024 rather than being introduced during the current price escalation. Certain local jurisdictions impose additional fuel taxes.
Oregon’s Clean Fuels Program adds another component to the state’s fuel marketplace. The program establishes declining carbon intensity standards for transportation fuels and creates credits and deficits based upon the carbon characteristics of fuels sold in Oregon. State calculations have previously measured the program’s average compliance cost for diesel in cents per gallon. Those expenses form part of Oregon’s overall fuel structure but are considerably smaller than the price movement recorded during the current escalation.
The speed and magnitude of the latest increase therefore cannot be attributed to a single Oregon tax, regulation or government action. Retail diesel prices combine crude oil costs, refining expenses, transportation and distribution, regional supply conditions, taxes, regulatory expenses and retail margins. International energy markets can alter several of those components simultaneously.
Geography adds another economic consideration for Oregon. The state stretches more than 350 miles from its northern boundary to California, while many rural communities sit considerable distances from major distribution centers. Businesses serving communities in Southern, Central and Eastern Oregon frequently depend upon highway transportation for both incoming inventory and outgoing products.
That dependence makes diesel an economic input extending well beyond the service station sign.
A grocery shipment arriving in Grants Pass, a load of construction materials traveling to Bend, agricultural equipment operating near Klamath Falls or a freight truck crossing the Blue Mountains all incorporate fuel into the cost of moving products or performing work. Businesses determine individually how much of an increase can be absorbed, offset elsewhere or incorporated into the prices charged for transportation, goods and services.
Current prices are also approaching historic territory in several Oregon markets. Grants Pass recorded its highest average diesel price at $6.824 in July 2022. Medford Ashland reached a record $6.722 in June 2022. Eugene Springfield peaked at $6.591 during the same period. Current Southern Oregon averages remain below those records, but the gap has narrowed considerably following the latest increase.
Oregon now enters September with diesel costs substantially above their levels of one month and one year ago, while West Coast federal data continue to show considerably higher prices than the national average. For a state whose farms, forests, construction sites, distribution networks and rural communities remain heavily dependent upon diesel powered transportation, the movement of fuel prices is increasingly becoming part of the operating cost attached to moving Oregon’s economy from one destination to the next.