The national average price of diesel fuel in the United States surged to an all time high of $5.820 per gallon on Thursday, surpassing the previous record of $5.819 set in June 2022 and making 2026 the most expensive year for diesel in American history. According to GasBuddy, prices have remained above $5 per gallon since mid July and are now up 55% since the U.S.-Israeli war with Iran began on February 28.
The relentless increase reflects a global distillate market being squeezed from several directions at once. The near closure of the Strait of Hormuz, a Russian diesel export ban following Ukrainian attacks on refineries and historically low U.S. stockpiles have combined to create one of the tightest diesel markets in decades.
The pressure is particularly visible in the profitability of refiners. The U.S. diesel crack spread, which measures the margin between crude oil and refined diesel, reached a record intraday high of $108.02 per barrel on Wednesday before settling at around $101.10. The spread has now exceeded $100 several times in August, a level never previously seen in market history and a sign that the main bottleneck is refining capacity rather than crude oil availability.
Before the war, approximately 900,000 barrels per day of diesel and 350,000 barrels per day of jet fuel moved through the Gulf. With those flows disrupted, U.S. refiners have increased operating rates to multi year highs to take advantage of elevated margins, but production has still not been sufficient to rebuild inventories.
The Energy Information Administration reported that total U.S. distillate stocks, which include diesel and heating oil, are at their lowest August level since 1982. On the East Coast, where millions of households depend on heating oil during winter, inventories fell to a record low 19.3 million barrels for the week ending August 28, the lowest level recorded in data going back to 1990.
Global Disruptions Deepen the Diesel Supply Crunch
International developments are adding further pressure to the U.S. market. Russia extended its diesel export ban through September 30 after a series of Ukrainian drone strikes damaged refining capacity. Russian refineries processed just 3.8 million barrels per day in August, well below the estimated 5.3 million to 5.5 million barrels needed to meet seasonal demand.
At least 26 Russian refineries have faced shutdowns, while the Kremlin has also prohibited gasoline and jet fuel exports through January 2027. The loss of Russian diesel exports, which previously supplied global markets with more than one million barrels per day, has forced the United States to increase exports to allies, placing additional pressure on domestic supplies.
Meanwhile, the Strait of Hormuz remains largely closed to normal commercial traffic, restricting Middle Eastern refined product shipments that would otherwise reach global buyers. The combination of disrupted international trade and increased demand for alternative supplies is leaving fewer barrels available to replenish U.S. inventories.
Diesel Demand Could Push Prices Even Higher
Industry experts warn that the most difficult period may still be ahead. Autumn brings peak diesel demand as farmers in the Northern Hemisphere harvest crops and farmers in the Southern Hemisphere prepare for planting, while heating oil consumption typically increases as winter approaches.
David Russell, Global Head of Market Strategy at TradeStation, said the market is entering a critical period for diesel consumption while inventories remain at exceptionally low levels. Andy Lipow, president of Lipow Oil Associates, has also warned that higher diesel costs can spread throughout the wider economy because the fuel is essential to trucking, agriculture and industrial activity.
Those higher operating costs can ultimately feed into prices for food and other consumer goods. Patrick De Haan, head of petroleum analysis at GasBuddy, has confirmed that 2026 is on track to become the most expensive year for diesel ever recorded.
With refinery disruptions abroad, war related changes to fuel exports and U.S. inventories at historic lows, the market is entering the high demand season with little safety margin. Farmers, truckers and households could therefore remain particularly vulnerable to further diesel price increases in the months ahead.
