Diesel prices have doubled on an east-central Wisconsin dairy operation in the past year, and the operator says the increase is hitting the farm's bottom line hard.

Janet Clark, who farms in Eldorado in Fond du Lac County, told Brownfield during the World Dairy Expo this week that fuel costs now rank among the pressures reshaping her operation's budget. "It makes a big impact to the bottom line, like everybody else," Clark said.

Her comment captures a broader squeeze facing dairy producers in Wisconsin and across the Corn Belt. Diesel sits at the center of a dairy farm's cost structure. It powers tractors for tillage, planting and harvesting, runs the mixer wagons that feed cows, and fuels the trucks that haul milk. When the price doubles, the increase reaches every one of those operations at once — planting, forage harvest, feed mixing, and hauling.

Clark said the farm cannot afford to absorb the increase as it has in other years, and it is now looking for savings elsewhere in the operation to offset higher fuel bills. The search for offsets is the practical question most operators in her position face: where in the budget can a farm give something back when an input doubles?

The timing matters for dairy economics specifically. Fuel is a major component of the cost of producing forage — corn silage and hay — that makes up the bulk of a dairy ration. Higher diesel costs raise the price of every ton of forage harvested and every load of feed delivered, even before purchased feed and fertilizer enter the picture. For a farm that grows much of its own feed, as most Wisconsin dairies do, the fuel increase lands directly on the cost of production per hundredweight of milk.

Clark's account also matches what other producers have reported anecdotally through the World Dairy Expo, the industry's largest annual gathering, held in Madison, Wisconsin. The event routinely serves as an informal sounding board for how input costs are tracking across dairy regions, and fuel has been a recurring complaint among attendees this year.

The World Dairy Expo continues through the week in Madison, where producers, cooperatives, equipment makers, and industry officials are assessing margins, input costs, and policy questions facing the dairy sector.