Oil markets are taxing Adams County’s harvest by holding diesel too expensive to run.
I was at the Cenex in Adams last Thursday filling the Silverado — nine gallons of off-road in the tank — and the pump was reading a dollar ten higher than it was the year Mike was born. I stood there watching the numbers roll and thought about the men who come into the shop every fall and say the same thing. Harvest is going to be tight this year. They say it the way the men at the Adams County Fair say it — meaning the math doesn’t pencil, meaning they are going to run the combine anyway because the corn is ready, meaning the fuel bill will be what the fuel bill will be.
In Adams County the harvest runs on diesel. Every bushel of corn that comes off a field here is pumped out by a combine running on number two fuel oil. Every truck that takes it to the elevator runs on diesel. Every tractor that pulls the chopper runs on diesel. The dairy operations that have not yet consolidated still run their milk trucks on diesel. The custom operators who come down from Portage County in October to help finish the beans run on diesel. Sara’s school district runs buses on diesel. The volunteer fire department runs its pumper on diesel. When the ice storm takes the lines down, the diesel generator on the neighbor’s place is what keeps the pipes from freezing. There is no electric combine. There is no easy substitute. The crop that pays my neighbors’ mortgages this fall will be paid for at the diesel pump, and the diesel pump is being kept expensive by people three thousand miles away.
Bank of America’s Francisco Blanch told the Journal this week what every farmer on Highway 13 already knows. The diesel market, his note said, is “poised to stay tight, volatile, and expensive well into next year.” He wasn’t guessing. He was reading harvest-related demand growth, low inventories, ongoing supply outages. The diesel market is not a mystery. It is a machine, and the machine is set to extract.
Most of the expense is being held in by what is happening in a strait most Adams County residents have never seen. The Strait of Hormuz — twenty-one miles wide at its narrowest — is the place where a fifth of the world’s traded oil moves every day, in tankers the size of city blocks. As of this week both the United States and Iran claim to control it. Aarathi Krishnan of Raksha Intelligence Futures told the Journal that she thinks the United States has significantly underestimated Iran’s resolve. President Trump posted on Truth Social that the United States is in complete control of the strait. The same morning, reports said few ships were moving through the waterway because the risk of Iranian attack made the war-risk insurance too dear. Even if a deal to reopen the strait is announced — as futures traders have been betting for weeks — the war-risk premium doesn’t come off overnight. Insurers, Krishnan explained, “look for patterns over two to three months” before they bring premiums down. That lag is what gets priced into diesel at the co-op pump.
The other half of the equation is OPEC+, which has held supply disciplined through the same period the strait has been at risk. China’s crude imports fell thirteen percent in the first seven months of the year, and even BofA’s analysts expect the full-year decline to be only “meaningful but incomplete” — meaning Chinese refineries are coming back, meaning more global demand, meaning more pressure on a supply side that has been disciplined since 2024. There was a 17.4-million-barrel build in U.S. commercial crude inventories one week last month, which the analysts at Ritterbusch called a one-off and markets read as possible weakening demand — and WTI dropped 2.6 percent on the news. The kind of one-week move that used to be the headline was a footnote this week, because the Strait and OPEC+ still hold the floor.
The structural setup is what makes it worse. The refineries that used to make the marginal gallon of distillate for the Midwest harvest have been shutting down or converting to other products for the better part of fifteen years. The capacity that used to backstop a normal September and October now sits at fewer locations, in larger complexes, on slates that lean export. When a global market is short, the Midwest harvest runs on the global price, because there is no longer a domestic cushion between the two. Consolidation in refining didn’t just concentrate profits. It concentrated capacity into coastal export-heavy slates, and it took the local resilience out of the supply.
The political theater at Hormuz isn’t new. The Carter Doctrine — January 23, 1980, the year after the Soviet invasion of Afghanistan — declared that any outside attempt to control the Persian Gulf would be repelled by any means necessary, including military force. The Tanker War of 1984 to 1988 saw the reflagging of Kuwaiti tankers, the USS Stark, Iran Air 655. What is new is that the diesel market on the other end of it is structurally tighter than in any of those previous episodes — commercial crude inventories stayed near operational limits through the spring and summer, the same chokepoint, a thinner supply behind it.
Wendell Berry wrote forty-nine years ago in The Unsettling of America that the consolidated-operator economy runs on extracting value from places like this one and sending it elsewhere. The diesel price at the Cenex in Adams is not set in Adams. It is set in the boardrooms of OPEC, in the offices of the war-risk underwriters in London, in the refineries of the Gulf coast, in the trading floors of New York. The agrarian tradition Berry spent his life writing about is built on the membership of place — on the idea that a community’s economy is its membership, and that membership requires people who have a stake in staying. A real rural fuel economy would be one in which the fuel was priced by the people who use it. There are pilot programs for on-farm biofuels and for cooperative fuel-buying, and they are worth the trouble, but they are not yet the answer. The answer is the structural one, and it has not been built.
What I know is what the notebook on the bench has been keeping twelve winters now — ice-out dates on Petenwell, rut-onset dates in the woods, first-mosquito-of-the-year dates, the syrup season. The woods have their own calendar, and they don’t price it off the global crude market. The diesel that runs the saw I use to clear the road to my deer stand in November does.
Whether Tehran or Washington is posturing more credibly is for cables, not for this column; the price at the co-op is the same either way. The harvest runs on diesel. The diesel is priced off a global market. The global market is short. The marginal barrel has to come through a place where two governments are claiming to be in charge and neither is letting the tankers through the way they need to move. The difference between what the harvest costs to run and what the harvest costs to put by used to stay here. It doesn’t anymore. And ready is the only word that matters in October — the corn comes off when the corn comes off, and the bill at the pump will be what the bill at the pump will be.