
U.S. corn, wheat and soybean futures fell after President Trump threatened tariffs on all Mexican goods, starting at 5% and rising until illegal migration stops. The grains had posted large monthly gains, so profit-taking added to the decline.
Heavy May rains had delayed planting and may have reduced the quality of the Plains wheat crop.
Mexico is the top foreign buyer of U.S. corn and wheat, so tariffs could cut export demand and weigh on prices. A weaker peso would also make Mexican imports of U.S. grain more expensive.
After 683 past bearish trade events, Corn moved a median -0.2% over 5 sessions (47% higher; middle half -1.7% to +1.6%), and +0.3% over 20.
After 803 past bearish trade events, Soybeans moved a median +0.0% over 5 sessions (51% higher; middle half -1.7% to +1.7%), and +0.9% over 20.
After 375 past bearish trade events, Wheat (SRW) moved a median -0.2% over 5 sessions (47% higher; middle half -2.0% to +1.1%), and -0.1% over 20.
Not enough comparable past events yet for a historical read.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.
On May 31 Trump's Mexico tariff threat sent wheat, corn and soy lower, and profit-taking after large monthly gains added to the selling, which fits the sharp drop in the final session.