Commodities June 15, 2026 09:25 AM

Grain Futures Slide After U.S.-Iran Accord; Oil Drop Weakens Biofuel Demand

Wheat, corn and soy contracts fall as reports say Tehran and Washington reached an initial deal to reopen the Strait of Hormuz

By Avery Klein
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Wheat, corn and soybean futures fell on Monday after U.S. President Donald Trump and Iran’s deputy foreign minister announced an initial agreement to end hostilities and restore traffic through the Strait of Hormuz. The diplomatic development pushed oil prices lower, weighing on agricultural commodities that serve as biofuel feedstocks, while weather and crop-condition reports provided additional pressure and context for markets.

Grain Futures Slide After U.S.-Iran Accord; Oil Drop Weakens Biofuel Demand
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Key Points

  • Wheat futures fell across Chicago, Kansas City and Minneapolis after an initial U.S.-Iran agreement was announced.
  • Crude oil moved lower following the diplomatic news, reducing demand expectations for biofuel feedstocks and pressuring corn and soybean prices.
  • French crop ratings improved year-on-year and week-on-week, while Morocco faces quality and harvesting challenges despite a large domestic wheat crop.

Futures for major U.S. grains moved lower on Monday as markets reacted to diplomatic developments between Washington and Tehran that suggested a de-escalation in the Gulf.

Chicago Board of Trade July soft red winter wheat last traded down 12-1/2 cents at $5.72 per bushel. Kansas City July hard red winter wheat fell 12-1/4 cents to $6.22-1/4 a bushel, and Minneapolis July spring wheat declined 8-1/4 cents to $6.10 per bushel.

Traders attributed part of the move to an announcement that U.S. President Donald Trump and Iran's deputy foreign minister had reached an initial agreement to end the war and resume maritime traffic through the Strait of Hormuz. Iran’s semi-official Mehr news agency reported that the draft deal calls for reopening the Strait within 30 days under Iranian arrangements, and that the United States and Iran will sign a memorandum of understanding in Switzerland on Friday.

The diplomatic news sent crude oil prices lower, and that drop in energy markets appeared to put additional pressure on agricultural commodities that have a growing role in biofuel production. July corn on the CBOT was last quoted down 6 cents at $4.06-3/4 per bushel.

Soybean futures also declined amid the weaker crude market. CBOT July soybeans were last down 10-3/4 cents to $11.02-3/4 per bushel. U.S. Midwest weather was cited as another factor for soybeans, with rainy conditions expected to help crop development.

Outside the United States, FranceAgriMer reported on Friday that French soft wheat crop ratings improved slightly, with 77% of the crop rated in good or excellent condition as of June 8, up from 76% a week earlier and from 70% a year ago.

Market participants also noted comments from the heads of Morocco's millers and grain traders federations. They said that Morocco's plan to reduce import dependency and to prioritize sales of domestically produced wheat faces obstacles because of poor protein quality and harvesting delays, despite the country having an ample crop.

Overall, the combination of a détente-driven drop in oil, weather supportive of U.S. soybean development, and mixed crop-quality signals abroad contributed to the downward price pressure across wheat, corn and soy futures on Monday.

Risks

  • Diplomatic developments remain fluid - the draft plan to reopen the Strait of Hormuz within 30 days and a planned memorandum signing in Switzerland could change market expectations for oil and, by extension, biofuel-linked agricultural commodities - impact: energy and agricultural markets.
  • Weather in the U.S. Midwest is expected to aid soybean growth, but actual seasonal conditions could diverge from forecasts and affect crop prospects and prices - impact: oilseeds and related markets.
  • Morocco's efforts to curb imports face uncertainty because of poor wheat protein quality and harvesting delays, which may complicate trade flows and local supply - impact: wheat trade and milling sector.

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