By: Editorial Team, StoneX Media
A run of consecutive corn yield reductions from the U.S. Department of Agriculture tends to be read as the start of a trend, and the reflex after a second monthly cut is to assume a third is coming. The historical record makes a weaker case for that assumption than the run of cuts suggests, because in the years that most closely resemble this one the national corn yield moved higher between the September report and the January final. Only four years in the previous 15 carried corn yield cuts on both the August and September WASDE and narrowing further to the years where the first cut arrived in August leaves a much shorter list. That shorter list is where the useful comparison sits, and it points toward a supply side that is close to settled rather than one still unwinding.
Mike Castle is Senior Commodities Economist at StoneX, based in Kansas City, where he covers grain, oilseed and fertilizer markets and tracks supply and demand fundamentals, U.S. Department of Agriculture data and global trade flows. His coverage of WASDE revisions and crop condition data across the growing season connects directly to the question of how an initial May corn yield estimate becomes a final January number.
"Given the parallels that we've seen this year, 2026 has felt a lot like 2022", Castle says, setting out why one year stands apart from the rest of the comparison set. Corn yield cuts from the U.S. Department of Agriculture on both the August and September WASDE occurred in only four of the previous 15 years, and two of those saw the first reduction arrive on the July report instead, which changes what the sequence means. Narrowing on that basis leaves a comparison built on matching cut timing rather than matching headlines, which is a harder test than it first appears. The parallels Castle points to run through the escalation in the Black Sea, the inflation backdrop and the crop condition trajectory into late summer rather than through the weather itself. For a corn buyer or producer reading the September report, the practical consequence is that the analog set is small enough that a single year carries most of the comparative weight.
A second consecutive corn yield cut does not establish the direction of the U.S. Department of Agriculture's remaining revisions, and the analog year demonstrates the reverse. Corn yield estimates in that year fell through August and September, slipped again on the October report, then recovered across November and the January final to finish above where September left them. Castle, addressing the assumption directly, argues that "a lot of the immediate reaction when you get that second in a row cut is, this is paving the way for them to continue moving lower, and I want to exercise caution, that's not always the case". Notably, the uncertainty that remains sits in what the agency cannot yet measure cleanly, specifically seed size and how pollination damage in one region offsets ideal conditions in another. Consequently, a market positioned for a third cut is carrying more revision risk than the run of reductions implies.
Managed money net length in corn has reached a record, surpassing the levels seen in the analog year, which changes how the market absorbs any further U.S. Department of Agriculture revision. Export demand shifting toward the U.S. in the 2026/27 marketing year, alongside an unresolved feed number on the balance sheet, leaves more room to move on the demand side than on a supply side that is nearly firm. According to Castle, "I truthfully think the demand side of the balance sheet is going to be much more influential to price in the rest of this marketing year". Whether that length persists depends on a catalyst rather than on the yield itself, with further escalation between Russia and Ukraine the most obvious candidate, evidenced by the ongoing restriction to movement from the Black Sea. Whereas short-term disruption in the analog year gave way to grain reaching the market, the restriction this time has not yet resolved.
--- Written by Gus Farrow, Senior Manager, StoneX Media
--- Expert: Mike Castle, StoneX Senior Commodities Economist
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Dry soil is slowing winter wheat planting in Russia and Ukraine, with a third of Ukraine's area in moisture deficit. Lost export revenue and costly diesel add a second risk to the size of the next Black Sea wheat crop.
September 23 – The Nasdaq hit another fresh all-time high yesterday, with the S&P 500 close to doing so as well, though stock futures are pointing to a quietly lower start to today’s session after surging higher to start the week as optimism surrounding this week’s various diplomatic pushes abounds. That optimism continues to be reflected in the VIX, continuing to hang around roughly three-week lows, trading at 14.3 this morning. The dollar is surging higher, adding to the week’s gains, as it nears the 101 mark for the first time in nearly two months. Treasury yields are off to a higher start, with 2-year yields back up to 4.80%, 10-year yields at 4.99%, and 30-year yields just above 5.32%. Crude oil prices are looking to hold their ground after a steady decline since late last week, with nearby WTI up 1.3% to trade near $91 and nearby Brent up 1.4% to trade near $100.65 at the time of writing. The ags are mostly lower to start the day, likely influenced in part by managed money selling off some existing length amid hopes for improvement regarding commodity flow through the Black Sea as part of this week’s diplomacy blitz.
September 22 – The Nasdaq and S&P 500 both closed within 1% of their all-time highs yesterday, with stock futures pointing to a quietly higher open at the time of writing. Diplomacy continues to be the theme of the week, with markets pricing in optimism, particularly in the tech sector following encouraging results from the weekend’s meeting between U.S. Treasury Secretary Scott Bessent and Chinese Vice Premier He Lifeng. It’s also worth noting that Bessent yesterday announced the two sides would be meeting again to discuss AI safety and communication protocols in Shenzen, China in about two months, another potential sign of cooperation instead of escalation. The VIX continues to reflect optimism regarding this week’s various diplomatic pushes as it hovers near its lowest level since early September, starting the day trading just below the 14.7 mark. The dollar is sitting just above unchanged, near 100.46 at the time of writing, touching a fresh two-month high earlier this morning. Treasury yields are quietly lower to start the day, also helping bring some calm to Wall Street, with 2-year yields at 4.747%, 10-year yields at 4.949%, and 30-year yields at 5.279%. Crude oil prices continue their push lower, with nearby WTI down another 1.8% to trade near $90.30 and nearby Brent down 1.6% to trade near $98.70, both roughly two-week lows. The ags are looking at a turnaround Tuesday to kick off the session with most of the complex in the red at the break, led down by the wheat complex. Improving forecasts for planting conditions for the U.S. winter wheat crop are likely having some influence, but I’d also point out the signs of potential increasing U.S. pressure on Ukraine, which we’ll dive into in more depth below, possibly spooking out some managed money length.
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