American farmers are burning through fuel budgets months early as the war-driven energy crunch compounds tariff-driven input inflation. AAA put the September 19 national average at $6.4866 a gallon, with North Carolina at a state-record $6.19 and California averaging $8.42. Growers who backed Trump three times now say they may split their tickets in November.
Diesel's 73% climb since the Strait of Hormuz closed has turned a fuel bill into an existential line item for American agriculture, and the political cost is landing on the White House's most reliable rural base.
The national average for diesel reached $6.4866 a gallon on September 19, according to AAA, up from $3.75 on February 27 — the last reading before the US-Iran conflict began. That is roughly 73% higher in under seven months, and nearly 75% above the $3.71 average a year earlier. North Carolina set a state record of $6.19 a gallon, and California's average sits at $8.4161, with some parts of the state approaching $10.
"This is a national farm crisis for farmers," said John Boyd Jr., a fourth-generation soybean, corn and wheat grower in southwest Virginia and president of the National Black Farmers Association. "I'm having to come up with money that's really not in the budget."
Boyd filled his combine on a Saturday and the bill came to roughly $1,000 — 140 gallons at about $7 a gallon, nearly double his year-earlier cost. He does not store fuel on the farm, so he hauls a couple hundred gallons at a time by truck and transfers it into the machine. "I'm, as my daddy would say, robbing Peter to pay Paul," he said.
The arithmetic is unforgiving. Corn is selling for about $5 a bushel, and the diesel to harvest it is now the largest variable cost in the field. Matt Bell, a North Carolina farmer, budgeted $35,000 for fuel in 2026 and had exhausted it by August; he now projects full-year spending of $50,000 to $60,000. His supplier quotes prices that hold in the morning and rise by the afternoon. Each combine burns about $600 of diesel a day.
The Energy Information Administration attributes diesel pricing to crude costs, refining margins, distribution, taxes and the crack spread — the gap between crude input and wholesale diesel. All five are moving the wrong way at once. The Hormuz closure removed a waterway that normally carries about 20% of global crude and LNG flows; Reuters reported in March that oil exports from eight major Middle Eastern Gulf producers had fallen at least 60% from February levels, and only a handful of commodity vessels now transit the strait on some days against roughly 125 daily transits before the war.
Attacks on Saudi Arabia's East-West pipeline have eliminated the main alternative route to export terminals outside the Gulf, while strikes on Russian refineries and Gulf refining infrastructure have removed distillate capacity. The US has absorbed part of the shortfall as a supplier of refined products to shortage markets, which has drawn down domestic diesel inventories. The result is a shortage of refined fuel rather than crude alone — the reason diesel has outrun gasoline, which rose about 50% over the same period to $4.4759 a gallon.
Chevron CEO Mike Wirth has warned that the global oil market has been losing the commercial and strategic buffers that previously contained prices, including inventories and spare capacity.
Fuel is only the first layer. Bell said fertilizer, fuel, pesticides, seeds and spare parts have all risen, and attributed most of the increase directly to tariff policy. "Everything we touch has gone up," he said. He has delayed equipment replacement, begun producing some of his own fertilizer, and added pumpkin picking and hayrides to bring in off-farm revenue.
The policy stack cuts both ways. To hold down food prices, the administration removed tariffs on imported beef — a move that landed on ranchers already absorbing higher fuel costs. "I'm already eating your high fuel prices out of nowhere. Come on, just help me a little bit," South Texas rancher Josh Eilers told Sky News. "I can't keep absorbing these costs indefinitely or I won't make it."
Texas rancher Lynn Fleming spent nearly double her prior-year fuel budget in August. Her husband, Robert Fleming, said the war caught them unprepared: "We had no warning about what was going to happen."
The last time US diesel exceeded $5 a gallon, in 2022, farm input costs rose sharply but the shock faded within two quarters as refining margins normalized. This episode has no comparable release valve while the strait remains restricted.
The damage is now measurable in balance sheets. Boyd told CNN that more than 400 farm foreclosure cases are pending nationwide, and Bell said he knows growers who have already exited because costs ran past what the season could support. "I don't want any American to feel sorry for the American farmer," Bell said. "I want Americans to be angry — angry that we've been put in this position. We're fighting for survival, and we're running out of options."
Asked what he would do if he stopped farming, Bell paused. "I don't know. It's the only thing I've ever done in my life."
That anger is converting into electoral intent. Bell, a Republican, said he may split his ticket in November and will judge candidates on whether they show "common sense" and listen. He supported the war initially, believing a short-term cost might be worth it, and now says: "I think we were misled." Boyd said farmers who voted for the president three times are now reachable by Democrats. "This is the farmers' breaking point," he said. "The tariff revenue was supposed to come back to farmers — that money went to big corporations. Nothing came, just a bunch of empty promises from this administration."
Robert Fleming put it more simply: "I'm worried there will be some changes in the vote — maybe a lot of people just won't vote, because a lot of people feel we ordinary folks aren't being heard."
The transmission chain from Hormuz to the ballot box runs through a single number. Diesel at $6.49 a gallon raises freight rates, farm costs and food prices, and it does so with demand that cannot flex the way a household's discretionary driving can — a truck moving grain has no substitute. With the November midterms roughly six weeks away and the strait still restricted, the price of a gallon of diesel is now a live input into both the US inflation path and the composition of the next Congress. Iran has reportedly signaled it could reopen the waterway within seven days if military pressure eases, which makes any de-escalation headline the single largest downside risk to diesel, farm input costs and food CPI.
This article is for informational purposes only and does not constitute investment advice.
