Overview
Diesel pump prices in parts of the U.S. Midwest reached record levels in May as disruptions to shipping through the Strait of Hormuz related to the Iran conflict tightened fuel availability. According to AAA data, Wisconsin recorded a diesel price of $5.873 per gallon in mid-May, Indiana reached $6.167 per gallon and Illinois hit $6.14 per gallon. Ohio and Michigan also reported record price readings during the same period.
Impact on farm operations
The surge in diesel costs coincided with the peak of spring field activity, when farmers increase use of diesel-powered equipment for planting, spraying pesticides, applying fertilizer and other essential tasks. The national average diesel price has climbed by more than 40% since the Middle East conflict began, and global crude oil values have been about 30% higher since late February. These moves in energy markets translate directly into higher operating costs for the region that produces the bulk of U.S. corn and soybeans.
Context for Midwest growers
The U.S. Midwest is the country’s primary corn and soybean-producing area, and farmers there entered the conflict period already under financial strain. The article notes growers were contending with a fourth consecutive year of shrinking profit margins prior to the conflict. Those margin pressures reflected a combination of drought conditions, high input costs and the impacts of President Donald Trump’s trade policies on crop prices.
For producers, higher diesel prices raise the cost of routine field operations during a critical season, compounding existing headwinds to profitability. The timing of the fuel-price spike - during planting and other intensive spring activities - means farmers must absorb increased fuel expenditures while managing other elevated input costs.
Key sectors affected - agriculture, fuel and broader commodity markets.