Diesel fuel averages $5.21 per gallon across the United States as of June 8, 2026, remaining elevated due to the ongoing Iran conflict and the closure of the Strait of Hormuz, a critical global oil chokepoint.
The closure of the Strait of Hormuz has removed approximately 14 million barrels per day from the global market, according to the Bipartisan Policy Center. That volume represents roughly 14 percent of projected 2026 global oil supply, triggering a 58 percent surge in diesel prices since the conflict began in late February 2026.
The Iran conflict erupted after U.S. and Israeli strikes on February 28, 2026. Iranian forces subsequently declared the Strait closed on March 4, 2026, disrupting one of the world’s most vital shipping lanes. The Strait of Hormuz typically carries approximately 20 percent of the world’s daily oil supply, making the disruption historically significant.
Impact on Agriculture and Transportation
Diesel prices in the Midwest hit record highs in May 2026, squeezing farm margins and raising input costs, according to Reuters. Farmers have delayed fieldwork and cut operations in response to the elevated fuel expenses. The National Corn Growers Association reported that it now takes 1.18 bushels of corn to buy a gallon of farm diesel, another record high.
The trucking industry has also felt the full impact. Higher diesel costs are expected to ripple through the U.S. economy, raising prices on everything from groceries to housing. Trucks ship 83 percent of agricultural products and 92 percent of dairy, fruit, vegetables, and nuts in the United States, according to the USDA Agricultural Marketing Service, meaning fuel surcharges will eventually reach consumers.
Comparison to 2022 Energy Crisis
The current diesel price environment echoes the 2022 energy shock triggered by Russia’s invasion of Ukraine. In June 2022, diesel prices peaked at approximately $5.62 per gallon, according to Time Magazine. Gas and diesel both peaked that month, but diesel’s producer price index was about 109 percent higher than in June 2021, compared with 85 percent for gasoline, according to the Federal Reserve Blog. Current prices remain in that historic range, though the underlying supply disruption differs: the 2022 crisis stemmed from sanctions on Russian oil exports, while 2026 prices reflect the closure of a major shipping route.
Energy analysts warn that if the Strait of Hormuz remains closed through the end of the year, prices for Brent crude could approach $200 a barrel, transforming the energy shock into a global economic crisis, according to Wood Mackenzie’s head of economics.
Sources
- Macrotrends — Historical U.S. diesel prices showing $5.21 per gallon as of June 8, 2026
- Federal Reserve Bank of St. Louis (FRED) — U.S. Diesel Sales Price data confirming $5.21 per gallon
- Bipartisan Policy Center — Analysis of Strait of Hormuz closure removing 14 million barrels per day and diesel rising 58 percent
- Reuters — Report on Midwest diesel prices hitting record highs in May 2026 and farmers delaying fieldwork
- National Corn Growers Association — Data on corn-to-diesel price ratio reaching record high of 1.18 bushels per gallon
- USDA Agricultural Marketing Service — Statistics on trucking’s share of agricultural product transportation
- Time Magazine — Report on diesel prices reaching $5.62 per gallon in June 2022 during Ukraine war
- Federal Reserve Blog (FRED Blog) — Analysis of Ukraine war’s effects on U.S. commodity prices, showing diesel PPI 109 percent higher in June 2022 versus June 2021
- Wood Mackenzie — Analyst forecast of Brent crude potentially reaching $200 per barrel if Strait closure persists
