Diesel Prices Surge as U.S. Farmers Enter the Fall Harvest

U.S. grain producers are confronting record diesel costs during the fall harvest, the agricultural sector’s most energy-intensive period, as global distillate fuel prices rise amid ongoing military conflict in the Middle East.

According to AAA, average retail diesel prices across the United States reached $6.05 per gallon on Friday. The increase followed a national record earlier in the month and marked a 60% jump from late February, when diesel averaged $3.76 per gallon just before military operations by the United States and Israel against Iran began.

The six-month war has disrupted commercial tanker traffic through the Strait of Hormuz, the maritime route between the Persian Gulf and the Gulf of Oman that handles roughly 20% of global petroleum shipments. On Sept. 4, U.S. diesel prices reached a record average of $5.85 per gallon as global fuel distributions faced compounding disruptions.

Corn and soybeans, the two largest agricultural commodities produced in the United States, are now moving through the critical autumn harvest window. In the Midwestern Corn Belt, field operations depend on massive volumes of diesel to power class-rated harvesting combines, high-horsepower tractors, grain carts, and long-haul commercial trucks carrying crops to storage elevators, ethanol processing plants, and river barges.

Jason Kurtz, a 49-year-old corn and soybean farmer near Forest City, Missouri, roughly 90 miles outside Kansas City, said his diesel expenditures have doubled compared with the previous year. His primary combine uses about 200 gallons, or 760 liters, of diesel per day. Over an expected 30-day harvesting schedule, that machine alone will consume 6,000 gallons, not including the fuel required by his tractors and haul trucks.

“We have to harvest,” Kurtz said in an interview at his farm on Tuesday. “We have to run the machines. We have to use the diesel, so it cuts into our bottom line.”

The higher fuel bill comes after agriculture input costs rose across the board this year. Certified seed stock, agricultural chemicals, heavy machinery maintenance, and natural gas-dependent nitrogen fertilizers such as anhydrous ammonia and urea have all become more expensive. Kurtz said his farm was already financially strained by fertilizer and crop-protection costs earlier in the growing cycle.

Crude oil shipments through the Strait of Hormuz have been pushed sharply higher by the disruptions, inflating prices for refined petroleum distillates including gasoline and ultra-low sulfur diesel fuel. For farmers, the pressure also reaches beyond the field and into the domestic grain distribution chain.

“Those prices hurt,” said Paul Mitchell, a professor of agricultural and applied economics at the University of Wisconsin-Madison. “And it’s not just the harvesting. It’s the hauling of everything, moving the grain or the silage from the field to the farm and then from the farm to wherever they’re selling it.”

Kurtz, who voted for President Donald Trump, said he intends to defer non-essential farm tasks until energy markets potentially stabilize. “That’s one good thing about farming,” Kurtz said. “Tomorrow will be different.”

Unlike expenses that can be deferred or reduced over time, grain harvest schedules are limited by weather conditions and crop maturity. Farmers have virtually no room to postpone field work while waiting for fuel prices to fall.

“Farms that are cash strapped, they’re the ones that are most having to figure out what to cut to make this work,” Mitchell said. “There are a lot of farms facing that.”