Diesel has become one of the sharpest cost pressures on U.S. farms at harvest, and the diesel to corn ratio shows exactly why. The diesel to corn ratio, the relationship between what farmers pay for fuel and what their corn is worth, has slipped to its worst level in about 20 years. U.S. distillate stocks are the tightest on record for this point in the season, while corn prices have lost momentum. For producers, that turns a national fuel story into a direct squeeze on farm margins right when the Midwest needs fuel most.
Mike Castle, StoneX Senior Commodities Economist, covers grain, oilseed and fertilizer markets and appears on outlets including American Ag Network discussing the factors moving farm prices, while Alex Hodes, StoneX Director Energy Market Strategy, tracks U.S. and global diesel supply flows, inventory balances and refinery run rates. Their coverage spans both sides of the diesel to corn ratio, from refinery output and regional fuel supply to corn demand and harvest progress.
Key Themes from the Discussion
The diesel to corn ratio sits at its worst level in about 20 years, squeezing Midwest farm margins at harvest.
Buyers who delayed diesel purchases expecting lower prices now face higher costs as harvest demand builds.
A wet, delayed Midwest harvest means much of the season's diesel demand is still to come.
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Diesel to Corn Ratio Squeezes Midwest Farm Margins at Harvest
The diesel to corn ratio has deteriorated to its worst point in about 20 years, meaning fuel is eating a far larger share of what a corn crop earns. Farmers have almost no room to respond, because diesel demand at harvest is highly inelastic and the equipment that brings the crop in cannot run without it. As a result, the ratio lands as a direct hit to margins rather than a cost producers can simply avoid. According to Castle, "you're not just going to leave the crop in the field and let it rot because diesel's too expensive".
Delayed Diesel Buying Leaves Farmers Paying More as Corn Stalls
"A lot of people had held off on buying diesel because everybody thought prices are going to go lower," Hodes says, describing how many buyers approached the Midwest diesel market. Diesel prices kept rising instead, so the wait has proved costly for farmers who now need fuel for harvest. Corn has offered little offset, since the corn rally slowed after the summit between U.S. President Donald Trump and Chinese President Xi Jinping produced few concrete commitments from China. Farmers are therefore covering higher diesel bills with a crop whose price has lost momentum, widening the gap in the diesel to corn ratio.
Harvest Delays Keep Midwest Diesel Demand Building
Harvest delays across the Midwest mean the heaviest diesel demand of the season has yet to arrive, keeping pressure on the diesel to corn ratio. Wet conditions have slowed fieldwork, and while the Delta and Southeast are moving quickly, Castle says there is "still a ton of demand yet to come to the table in the Midwest". Diesel supply offers little cushion, with refineries running hard and several undergoing maintenance, and "it's an environment where if anything goes wrong you can see some price spikes," Hodes adds. For producers, that combination leaves diesel costs exposed to sudden jumps through the rest of harvest.
--- Written by Gus Farrow, Senior Manager, StoneX Media
--- Expert: Alex Hodes, StoneX Director Energy Market Strategy
--- Expert: Mike Castle, StoneX Senior Commodities Economist
Grains & Oilseeds
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