US Harvest Accelerates as the Yield Test Begins

The US corn and soybean harvests are running ahead of their normal national pace, moving the market from condition estimates towards realised yields. But the national figure conceals an uneven start: Illinois and several southern states are well ahead, while Iowa — the largest producing state — has barely begun, meaning the first harvested yields are not yet a representative test of USDA's September assumptions.

TL;DR

Corn harvest reached 13%, against 10% last year and an 11% five-year average, while maturity jumped from 42% to 58%. Condition held at 57% good/excellent, nine points below last year.
The lead is uneven. Illinois is 16% harvested against a 9% average, and Kansas, Kentucky, Missouri and Tennessee are all well ahead, while Iowa is only 4% harvested after a week with just 1.7 days suitable for fieldwork.
Soybean harvest doubled to 12% against an 8% average, with condition steady at 58% good/excellent, three points below last year. The prospective record crop still rests on acreage rather than yield.
Cotton harvest reached 13% and bolls opening 65%, both ahead of normal, but condition slipped to 34% good/excellent against 47% a year ago.
Winter-wheat planting reached 17%, behind the 21% five-year average — worth monitoring, but too early to be a production signal.
The yield test has begun, but until Iowa contributes a larger share of the harvested acreage, early results should not be read as a national verdict.

US Crop Dashboard

Crop / stage	This week	Last week	Last year	5yr avg
Corn — mature	58%	42%	54%	55%
Corn — harvested	13%	8%	10%	11%
Soybeans — dropping leaves	62%	44%	58%	58%
Soybeans — harvested	12%	6%	8%	8%
Cotton — bolls opening	65%	57%	59%	58%
Cotton — harvested	13%	8%	12%	11%
Winter wheat — planted	17%	8%	19%	21%
Winter wheat — emerged	2%	n/r	4%	4%

n/r = not reported in the previous week's national Crop Progress table; it does not mean zero.

National Crop Condition Dashboard

Crop	Last week G/E	Very poor	Poor	Fair	Good	Excellent	This week G/E
Corn	57%	6%	11%	26%	44%	13%	57%
Soybeans	58%	4%	10%	28%	46%	12%	58%
Cotton	36%	10%	25%	31%	28%	6%	34%

Corn and soybean ratings were unchanged and cotton weakened. The more important development is the pace of harvest: condition ratings increasingly describe the crop entering the combine rather than one still developing, and from here harvested yields become the more useful evidence.

Corn: The Yield Test Begins, Unevenly

Corn harvest advanced from 8% to 13% nationally, ahead of last year's 10% and the 11% five-year average, while maturity rose from 42% to 58%, three points ahead of normal. On the face of it, the market should begin receiving meaningful field evidence against USDA's September assumptions earlier than usual.

The state data show that the national lead is uneven. Illinois, the second-largest corn state, is 16% harvested against 11% last year and a 9% average, and several southern and Plains states are well ahead: Kansas at 40% against a 28% average, Tennessee at 62% against 42%, Kentucky at 46% against 34% and Missouri at 32% against 23%. Iowa, by contrast, had only 1.7 days suitable for fieldwork and is just 4% harvested — three points behind last year and one behind its 5% average — with maturity at 56% against a 58% average. Ohio, with 2.8 suitable days, is 2% harvested against a 4% average.

The early sample therefore includes substantial Illinois acreage but very little from Iowa, the largest producing state, which carries substantial weight in the national yield. Iowa is also rated better than the national crop, at 76% good/excellent. Early national yield reports should not yet be treated as a representative test.

The crop being tested remains weaker than last year's. Corn held at 57% good/excellent, nine points below 2025's 66%, with 17% rated poor or very poor against 10% a year ago. USDA's September Crop Production cut national yield to 178.5 bushels per acre, eight bushels below 2025, and production to 15.800 billion bushels — a reduction that, as last week's edition showed, came predominantly from yield rather than acreage. That 178.5-bushel figure is now the harvest benchmark.

The balance sheet gives it weight. USDA projects 2026/27 ending stocks of 1.567 billion bushels against total use of 16.180 billion, a stocks-to-use ratio of about 9.7%, with September's yield cut partly absorbed by a 150-million-bushel reduction in feed and residual use. There is some demand-side flexibility, but little supply cushion if realised yields force USDA below 178.5. Managed money, meanwhile, holds +414,460 contracts net long, effectively unchanged on the week: the speculative build has stopped without unwinding, and the more meaningful test of it will come as Iowa's harvest gathers pace.

Soybeans: More of the Record Crop Comes Into View

Soybean harvest doubled from 6% to 12%, four points ahead of both last year and the five-year average, and leaf drop reached 62%. Condition held at 58% good/excellent against 61% a year earlier.

The production question is unchanged from last week: whether USDA's 52.8-bushel yield survives harvest. That figure is already below 2025's 53.0 bushels, so the prospective record crop of 4.535 billion bushels reflects a much larger harvested area — 85.881 million acres against 80.437 million — rather than a better-yielding crop. The balance sheet is also tighter than the headline suggests, with USDA raising 2026/27 exports by 25 million bushels in September and cutting ending stocks to 310 million from 320 million.

Positioning is moving the other way from corn. Managed money cut soybean net length by 15,757 contracts to +241,501 in the week to 15 September, liquidating longs and adding shorts, even as soybean meal and oil attracted fresh length. Funds are reducing exposure to the raw bean as harvest evidence arrives, despite a yield forecast below last year and a tightening carryout.

Cotton: Weak Condition Meets the Combine

Cotton remains the weakest of the three major crops. Condition fell from 36% to 34% good/excellent, against 47% a year ago, and two-thirds of the crop is rated fair, poor or very poor. Development is nonetheless ahead of normal, with bolls opening at 65% against a 58% average and harvest at 13% against 11%.

USDA had already cut all-cotton production 3% to 13.20 million bales in September, with yield down 22 pounds to 776 pounds per harvested acre, 76 pounds below 2025. Harvested area of 8.16 million acres is above last year's 7.83 million despite much higher abandonment — the opposite of soybeans, where extra acreage more than offsets a lower yield. This week's decline does not prove the 776-pound figure too high, but it offers no sign of a late recovery before harvest takes over. Managed money cut cotton net length by 3,432 contracts to +91,935 over the same week, reducing exposure to the crop with the weakest condition profile.

Winter Wheat: A Slower Start

Winter-wheat planting reached 17%, up from 8% but behind 19% last year and the 21% five-year average, with emergence at 2% against 4% for both comparisons. A four-point lag in September is worth recording but says little yet about establishment or yield; the question is whether it persists. Separately, Chicago SRW managed money moved back to −3,674 net short in the latest CFTC report. For now these are two monitoring points rather than a combined thesis.

Outlook

Base case: Harvest continues close to or ahead of its normal pace as Iowa catches up, and USDA's September yield assumptions remain broadly intact: corn near 15.800 billion bushels, soybeans close to a record on the larger acreage base, and cotton retaining most of the loss already incorporated.

Upside risk: Yields outperform once Iowa and the rest of the northern Corn Belt enter the sample. Corn holds above 178.5 bushels, easing pressure on a sub-10% stocks-to-use ratio; soybeans sustain 52.8 bushels or better; cotton beats its condition profile.

Downside risk: The early results prove unrepresentative and Iowa's harvest disappoints, pushing corn below 178.5 bushels. Soybean yield falls enough to erode the acreage-driven record, and cotton requires a further cut from 776 pounds.

What would change the view: Consistent yield evidence above or below USDA's assumptions across a geographically representative share of the major states — Iowa included — followed by revisions in the October Crop Production report.

Key Risks

Harvest geography. The national corn lead masks substantial regional divergence. Illinois and several southern and Plains states are ahead of normal, while Iowa is barely 4% harvested. Early national yield reports should not be extrapolated until more core Corn Belt acreage enters the sample.
Corn yield. A further cut below 178.5 bushels would bite into a balance sheet with stocks-to-use near 9.7%.
Soybean acreage. The prospective record depends on 85.881 million harvested acres offsetting a yield below 2025.
Cotton condition. With two-thirds of the crop rated fair or worse, the 776-pound assumption is exposed as harvest advances.
Positioning. Corn funds remain heavily net long as harvest begins testing the thesis, while soybean and cotton exposure is already falling.

Intelligence Monitoring Points

Iowa harvest progress, currently 4%, as a key test of when national yield evidence becomes more representative.
Corn yield against 178.5 bushels, and stocks-to-use near 9.7%.
Soybean yield against 52.8 bushels across 85.881 million harvested acres, and carryout at 310 million.
Cotton yield against 776 pounds with condition at 34% good/excellent.
Corn positioning at +414,460 and soybean positioning at +241,501.
Winter-wheat planting at 17% against a 21% average.
October Crop Production, the next incorporation of harvested evidence.

FAQ

How far ahead is the corn harvest? Nationally, 13% harvested against 10% last year and an 11% average. The lead is uneven: Illinois is 16% harvested against a 9% average and several southern and Plains states are well ahead, while Iowa is only 4% harvested.

Why does Iowa matter so much? It is the largest corn-producing state, so a national sample with very little Iowa acreage is not yet representative of the crop that will determine the final yield. Iowa is also rated better than the national crop, at 76% good/excellent.

Why is the soybean crop a record if yield is lower? Acreage. USDA expects 85.881 million acres harvested against 80.437 million in 2025, which lifts production to a prospective 4.535 billion bushels despite a 52.8-bushel yield below last year's 53.0.

Is cotton still deteriorating? Condition slipped to 34% good/excellent against 47% a year ago, though development is ahead of normal. Harvest results will now test USDA's 776-pound yield.

Is winter-wheat planting a concern? Not yet. Planting is 17% against a 21% average; one September reading is not a production signal.

Data and source note: National and state progress, condition and fieldwork figures are from USDA NASS's Crop Progress report for the week ended 20 September 2026, released 21 September; the Iowa condition figure is from the corresponding Iowa report. Production, yield, acreage and stocks figures use USDA's September Crop Production report and WASDE. Managed-money references use the CFTC Disaggregated Commitments of Traders — Futures Only report for positions held 15 September. Crop Progress percentages are survey-based estimates, not measurements of realised yield.

Sources

This document is published by Bloodstone Research for informational and institutional research purposes only. It does not constitute investment advice, an investment recommendation, an offer or solicitation to buy or sell any financial instrument, commodity or security, or a forecast of future performance. Market conditions and data may change without notice. Readers should conduct their own analysis and, where appropriate, seek independent professional advice before making investment decisions. For institutional enquiries contact research@bloodstonecapital.co.uk.

US Crop Intelligence — Harvest Accelerates as the Yield Test Begins