Wisconsin Diesel Prices Hit Record Highs
Supply disruptions at regional refineries have pushed fuel costs to historic levels for state agricultural producers.
Updated on Sept. 21, 2026 in Agriculture
Live Poll
Do you expect the current spike in diesel prices to increase your household grocery bills?
Wisconsin diesel prices surged to a record $6.19 per gallon as of Sept. 17, marking seven consecutive days of record-breaking costs. This spike aligns with a national record of $6.45 per gallon reached on Sept. 18.
Why it matters
Rising fuel costs have dramatically increased the operational expenses for state farmers during the harvest season. The price surge is driven by a combination of limited regional refinery availability and global supply constraints.
Operating farm machinery now costs $93.60 per hour, a sharp increase from the $51.90 hourly cost recorded one year ago. Meanwhile, crop transport haulage fees have jumped to an expected 49 cents per bushel from 29 cents last year.
The players
Exxon Mobil
This multinational oil and gas corporation operates a major refinery in Joliet, Illinois.
BP
This global energy company manages a large refinery in Whiting, Indiana, that has faced recent operational challenges.
United Steel Workers
This labor union represents approximately 800 workers currently locked out of the BP Whiting refinery.
The details
Local fuel availability has been constricted by a power outage and subsequent flooding at the Exxon Mobil refinery in Joliet, Illinois, as well as technical issues at the BP refinery in Whiting, Indiana. These domestic complications are compounded by the global reduction in supply following the suspension of Russian diesel exports on Sept. 14.
Timeline
April 2026: Labor lockout began at BP Whiting refinery.
September 13, 2026: Power outage occurred at Exxon Mobil Joliet refinery.
September 14, 2026: Russia suspended diesel exports.
September 17, 2026: Flooding hit Joliet refinery and BP Whiting had technical issues.
September 18, 2026: National diesel price hit record $6.45 per gallon.
Market Landscape
This regional price surge illustrates the domestic impact of the broader 2026 global diesel supply contraction. The combination of localized refinery outages and international export bans has intensified competitive pressures across the agricultural logistics sector.
Farmers are facing significantly higher overhead due to both elevated fuel prices and increased crop transport surcharges. Consumers may eventually see these logistical costs reflected in the broader agricultural supply chain and retail produce pricing.
The takeaway
The convergence of regional technical failures and international export limitations has created a costly environment for agricultural producers. Growers may need to adjust their harvest logistics to mitigate the impact of historically high fuel and transport fees.
Further reading
Learn more about local sector trends in the Wisconsin Agriculture section.
Live Poll
Do you expect the current spike in diesel prices to increase your household grocery bills?
