Diesel prices are rising across the nation, and California is taking an especially hard hit, as recent escalations in the Middle East continue to disrupt global oil flows.
San Francisco on April 4 became the first city in the United States to record an average diesel price above $8 per gallon, according to fuel price-tracking platform GasBuddy.
Patrick De Haan, the platform’s head of petroleum analysis, said on April 4 that California’s statewide average had climbed to $7.63 per gallon, by far the highest in the nation. He said that seven states were seeing average diesel prices of more than $6 per gallon.
As of the morning of April 6, the national average diesel price stood at $5.57 per gallon, according to De Haan, who said in an X post that gasoline is likely to rise to $4.20–$4.35 per gallon in the coming days.
“Diesel prices continue to climb as well and now sit just 25 cents away from setting a new all-time record,” he wrote. “Recent escalations between the U.S. and Iran have further intensified concerns about prolonged disruptions to global oil flows, keeping markets on edge.”
Diesel is a critical fuel for the economy, as it powers trucks, ships, farm equipment, and construction machinery. A spike in diesel prices drives up transportation and production costs, which can lead to higher prices for food, consumer goods, and services.
Diesel supplies are often tighter than gasoline supplies because diesel requires a different refining process and has to compete with jet fuel and heating oil for refinery output. Global disruptions have put additional pressure on distillate inventories, helping drive diesel prices higher in the wake of Iran’s threat against ships that pass through the Strait of Hormuz, a critical choke point that carried nearly 20 percent of the world’s oil before the war.
Although diesel prices in much of the rest of the country have begun to stabilize, California’s prices remain significantly higher. The most recent data from the U.S. Department of Energy showed that nationwide diesel prices rose by just 2.6 cents in the last week of March, and three regions posted declines.
Unlike many other states, California lacks major interstate pipelines connecting it to outside crude oil or refined fuel supplies. The state relies heavily on imports from Alaska and foreign sources arriving by ship, rail, or truck, as well as in-state refineries that already face limited capacity because of planned closures.
At the same time, California’s trucking, agriculture, and shipping sectors remain heavily dependent on diesel, keeping demand elevated even as prices rise.
California also mandates a special fuel blend designed to reduce smog-forming gases and benzene emissions. Although it is cleaner, the fuel is more expensive to produce because it requires additional processing and pricier blending components, according to the U.S. Energy Information Administration. The state also has some of the nation’s highest fuel taxes and environmental fees, further lifting prices at the pump.
As of April 6, the national average price for regular gasoline was about $4.12 per gallon, according to the American Automobile Association. California’s statewide average was about $5.92 per gallon, nearly $2 higher.
