Corn futures soared by the most since June after the US Department of Agriculture delivered a bigger-than-anticipated reduction in yield as hot weather impacts America's top crop. According to Bloomberg, futures climbed by as much as 4.6% in Chicago, with prices surpassing gains in wheat which was already surging earlier Wednesday with an attack on a key Russian grain port adding to concerns that an escalating conflict between Ukraine and Russia will disrupt exports from the Black Sea region. The USDA estimated the US corn yield at 180.7 bushels per acre, down from 183 last month and off sharply from last year's record of 186.5. Despite the yield cuts, production will rise slightly to 16.013 billion bushels, the second-biggest US harvest ever as some states including top grower Iowa will have record yields, according to the agency's monthly outlook. The USDA has been aiming to improve its analysis, including use of satellite imagery and their own field checks to supplement tens of thousands of surveys sent to farmers.
Traders are waiting for USDA to clarify the size of the U.S. corn and soybean crops, a critical variable for the supply chain and cash markets heading toward harvest. Expectations point to corn production just below 16 billion bushels, while the soybean crop could approach 4.5 billion bushels. Those volumes could reinforce supply pressure if yields remain strong, making Wednesday's WASDE especially important for farmers evaluating storage, hedging and forward-contracting decisions. A larger-than-expected yield or production estimate could reinforce bearish pressure, while tighter stocks or a production surprise could force traders to rebuild risk premium. With corn near $4.60 on the December contract, November soybeans below $11.70 and wheat retreating despite geopolitical supply risks, the report arrives at a sensitive moment for 2026 farm profitability. Bloomberg reports that analysts expect the USDA to cut wheat and corn estimates, even as Chicago futures remain weighed by net bearish positioning. US and global corn ending stocks are expected to decline in the USDA's upcoming WASDE report, for both old and new crops, while US 2026/27 production is also expected to land lower, according to a Fastmarkets poll of analysts. Analysts surveyed ahead of the report were looking for USDA to trim its corn yield estimate from 183 bushels per acre (bpa) in July to about 182.4 bpa, putting production near 15.93 billion bushels.
After Monday's close, the USDA trimmed its weekly soybean condition rating while keeping its corn score steady. The rating of U.S. corn in good-or-excellent condition remained unchanged at 61%, while soybean condition fell by one point to 62% good-or-excellent. Crop development also remains relatively fast: 94% was silking, 61% had reached dough stage and 16% was dented. Soil moistures were mostly down for the week, with 11 states reporting lower moisture. The USDA noted that "the weather last week was generally favorable for crop development," with forecasts calling for 1 to 2 inches or more of rain possible from the Dakotas through the eastern Corn Belt later in the week, while hot and generally dry conditions are expected in southern areas and the Delta. Recent rains have generally been helpful across much of the Corn Belt, particularly Ohio, Indiana, Iowa and Minnesota, with early scouting reports encouraging good kernel fill and relatively little tip back reported in several states. Minnesota may even have record potential, while Iowa and Illinois are generally looking at trendline to slightly above-trend yields, though the Dakotas and parts of Nebraska continue facing heat and dryness that have chipped away at yield potential.
The USDA announced significant Chinese purchases of U.S. agricultural products, with 5 million bushels of U.S. soybeans sold to China for delivery in the 2026/27 marketing year, and 180,000 tons of soybean meal sold to the Philippines for delivery in 2026/27. These purchases follow reports of new buying from Chinese state agents and come ahead of tomorrow's monthly WASDE report, providing additional market support despite the overall decline in grain futures. The market's inability to rally on that demand news suggests that traders remain focused on prospective production and ending stocks rather than isolated export announcements. Soybean export inspections are running 18% below last year, but the current total is still slightly ahead of the seasonal pace needed to reach USDA's target. More importantly, StoneX sources expect China could ultimately import as much as 25 million metric tons, compared with roughly 16 million metric tons built into USDA's current new-crop projection, which could tighten the soybean balance sheet faster than the market currently expects. USDA export inspections totaled 68.5 million bushels for the week ending Aug. 6, pushing marketing-year inspections to 3.11 billion bushels, which is about 25% ahead of last year and already above the pace needed to meet USDA's current export target.
Adding to domestic pressure, Brazil's August corn exports are projected at 203.5 million bushels, roughly 27% above the previous estimate of 160.6 million. That larger export flow could increase competition for U.S. grain at a time when producers need stronger demand to absorb potentially abundant domestic supplies. In the Ukrainian corn market, activity remained limited as buyers and sellers continued to monitor heightened geopolitical developments, with much of the trade remaining on the sidelines. Ukraine's agriculture ministry expects agricultural exports to fall to 29.6 million metric tons from an earlier 64.4 million-ton estimate after Russian attacks disrupted Black Sea port activity, while wheat exports could fall 53% from previous forecasts. Given the recent strikes in the Black Sea, the USDA trimmed its outlook for top shipper Russia's wheat exports by 500,000 tons, and reduced Ukraine's by 1 million. The two countries account for about a quarter of global wheat exports, with US wheat output, already forecast to be the lowest since the 1970-71 season, trimmed slightly on weaker yields. Geopolitical risk is providing some support, with continued disruption around the Black Sea a concern because Russia and Ukraine account for more than a quarter of global wheat exports, while Ukraine is also a major corn exporter.
