Corn futures finished Friday with modest gains, wrapping up a third straight weekly advance. December 2026 corn settled at $4.89/bu, up 4.2¢ for the session and roughly 14¢ above the prior Friday's close. September corn finished at $4.65/bu (+3.6¢). The complex is up about 14% since July 1, leading all agricultural commodities this month.
The rally was sparked by the July WASDE report, in which USDA slashed 2026/27 ending stocks to 1.79 billion bushels, 170 million below the June WASDE estimate and below nearly all trade expectations. Global ending stocks came in at 275.3 million metric tons, the tightest level in three years. The data forced the market to reassess what had been a bearish consensus on ample global corn supplies.
Export demand backs the supply story. In the week ending July 16, USDA reported old-crop export sales of 332,679 MT, slightly above the prior week, with Mexico the top buyer at 203,300 MT. New-crop sales hit 701,505 MT, the fourth-largest weekly total this marketing year. Colombia and unknown destinations accounted for the bulk of new-crop purchases. Cumulative new-crop exports are running ahead of the pace USDA needs for its full-year target.
USDA's July 20 Crop Progress report showed the corn crop rated 67% good-to-excellent, down 1 point from the prior week and 7 points below last year's 74%. Silking reached 59%, ahead of both last year (53%) and the five-year average (54%). Dough stage reached 13%, in line with last year. The drop was concentrated in the Dakotas. North Dakota's G/E rating fell 10 points after a hot, dry week. DTN Lead Analyst Rhett Montgomery flagged that the Dakotas, Minnesota, and northern Iowa face continued dryness risks.
The next month comes down to weather during pollination. AccuWeather meteorologist Chad Merrill projects that July heat will dent yields by 5-6% from the current 67% G/E baseline, with mid-90s temperatures expected in 3-day stretches between storm systems. DTN's John Baranick noted that a cold front will break the current heat wave but bring uneven rainfall, with the northern Corn Belt remaining relatively dry. September is forecast to bring wetter conditions that could support late-season crop development.
Open interest data suggests new money continues to flow into corn. Total open interest rose by 16,521 contracts across the week, with December 2026 open interest rising 0.47% to 771,080. Implied volatility on the CME's CVL index jumped 3.5 points to 31.75, the highest in a week, reflecting elevated uncertainty around yield outcomes. Options activity concentrated around the December 530 calls (93,613 OI) and 410 puts (26,315 OI), implying the options market prices a wide range of potential outcomes.
The bull case rests on three pillars: (1) tighter-than-expected 2026/27 balance sheet with minimal room for further supply shocks, (2) strong new-crop export demand that suggests global buyers are securing supply early, and (3) elevated weather risk during pollination for a crop that has already lost condition in key northern producing areas. Bears point out that 67% G/E is still normal range, the Dakotas account for a modest share of total production, and the 14% July rally has already priced in a significant weather premium. Arlan Suderman at StoneX says money flow momentum favors bulls short term, but warns a return to normal weather could trigger a sharp correction.
Basis levels are elevated in the western Corn Belt. Farmers are holding old-crop inventories and processors are bidding aggressively for what's available. The CmdtyView national average cash corn price was $4.34/bu on Thursday, up 2¢ on the week. Gulf export basis held firm on strong demand.
Corn buyers should consider three factors over the next 30 days. First, the USDA's 1.79 billion bushel ending stocks estimate leaves almost no cushion. A 5-6% yield reduction from weather stress would push stocks below 1.5 billion bushels and could send December corn toward $5.50/bu. Second, new-crop export demand is front-loaded, which means any supply disruption will have an amplified price impact because global buyers have already committed to volumes. Third, the options market is pricing wide yield uncertainty, reflected in the elevated CVL at 31.75. For buyers with exposure through Q4 2026 and Q1 2027, consider layering in coverage on any break below $4.70/bu December futures. The risk is asymmetric to the upside through August. If weather cooperates and the crop finishes well, prices could retreat to $4.40-4.50/bu by harvest, but the downside is capped by the tight stocks situation.