Corn futures surpassed the $5-a-bushel mark, reaching $5.005, a level not seen since February 2025. This increase is primarily attributed to weaker-than-expected results from the Pro Farmer Crop Tour in key US producing states like Iowa and Illinois. Reports indicated corn yields in these states were below last year's figures and the three-year average, with Illinois specifically showing a 7.7% drop from 2025's 199.57 bushels per acre to 184.19 bushels per acre. These subpar domestic crop prospects are exacerbated by earlier severe storms and sweltering temperatures across the central US. Despite the increase, some analysts, like Naomi Blohm of Total Farm Marketing, suggest that $5 will likely serve as a significant resistance level as harvest approaches.

The global supply situation is also contributing to the price rally. Europe experienced a series of summer heatwaves, leading France to forecast its smallest corn harvest since 1980. Additionally, attacks in the Black Sea have significantly disrupted corn exports from Ukraine, another major supplier, just before its harvest. These international factors, combined with the domestic yield concerns, are collectively tightening global corn supplies.

The gains in corn prices have helped push the Bloomberg Agriculture Spot Index to a three-year high this week. While the higher prices could incentivize farmers to increase sales, potentially improving near-term availability and exerting downward pressure on prices, the overall sentiment points to a tighter market. The December 2026 corn futures closed at $5.03 1/2, up 5 1/2 cents, while March 2027 corn closed at $5.18 1/4, up 4 1/2 cents.

Looking ahead, weather remains a critical domestic variable, with forecasts indicating limited rainfall in most central US areas, except for parts of the Ohio River Valley. Longer-range outlooks predict wetter conditions in the Northern Plains and above-normal temperatures in the Midwest and Plains. These conditions will influence final corn and soybean yields. The market's next challenge is whether these stronger prices can withstand the seasonal pressure of harvest, with factors such as USDA export sales, actual field yields, Chinese soybean demand, ethanol consumption, and Black Sea trade flows determining the longevity of the rally.