Grain prices hold above three-year averages on Black Sea disruption and fund flows
Soybeans, corn and wheat in Chicago are trading 15.5% to 26.5% above their three-year averages in September 2026 despite ample global harvests, with Black Sea logistics disruption and fund positioning providing much of the support. Current quotations remain 26% to 44% below the peaks recorded since 2006, and the international recovery has passed only partially into Argentina's domestic market.
Grain quotations on the Chicago market are running above their three-year averages in September 2026 even though global harvests remain abundant, with war-related logistics disruption and the positioning of investment funds supplying much of the support, according to the Argentine daily Clarín.
As of 15 September 2026, soybeans were quoted at around $482 per tonne, corn at $219 per tonne and wheat at $267 per tonne. Measured against the average of the past three years, that represents gains of 15.5%, 22.6% and 26.5% respectively. The three-year reference levels stand at $417.4 per tonne for soybeans, $178.7 per tonne for corn and $211.0 per tonne for wheat, meaning the market has left behind, at least for now, the depressed price zone of 2024 and 2025.
Above recent averages, far below the records
The comparison changes once the horizon is widened. The highs recorded since 2006 were $650 per tonne for soybeans, reached in June 2022; $327 per tonne for corn, set in 2012; and $475.5 per tonne for wheat, reached in March 2022, immediately after the start of the war between Russia and Ukraine. Current prices sit between 26% and 44% below those marks: soybeans roughly 26% below, corn 33.1% below and wheat 43.9% below.
Luciana Bilbao, grain analyst at Gestor Max, placed the current levels within the historical distribution. “If all quotations available since 2006 are ranked, the current soybean price exceeds approximately 72% of historical observations. Corn sits around the 74th percentile and wheat reaches roughly the 80th percentile,” she said, adding that current values can be considered relatively high, especially in wheat, though not extraordinary compared with the major price peaks of the past two decades.
Large supply, but tighter balance sheets
Two opposing forces are at work in soybeans. Supply remains substantial: in September the USDA projected United States 2026/27 soybean production at about 123.4 million tonnes, with harvested area that could reach record levels, which caps upside potential. At the same time industrial demand keeps growing. The agency raised its projection of US crush to 75.7 million tonnes and expects global crushing to expand, driven by rising demand for soybean meal and oil.
In corn the recovery is more pronounced. At roughly $219 per tonne, the price is close to the upper end of its recent range: between September 2023 and September 2026 corn fluctuated between $153 and $222.5 per tonne. In its September report the USDA cut its estimate of United States corn production for 2026/27 from 406.7 million to 401.3 million tonnes, a reduction of 5.4 million tonnes against August, and lowered projected ending stocks from 42.0 million to 39.8 million tonnes. Absolute availability remains high, but the projected balance shows less slack than a month earlier.
Wheat carries the Black Sea premium
Wheat is the most prominent of the three. At close to $266.9 per tonne in September it stands 26.5% above its three-year average and exceeds roughly 80% of observations in the series analysed since 2006. Within the past three years wheat traded as low as $182.5 per tonne, making the current level a recovery of about 46.3% from that floor.
The international context has been decisive. Attacks and logistics interruptions in the Black Sea region reintroduced a strong geopolitical premium, with Russia and Ukraine central to world wheat trade and problems affecting ports, infrastructure and navigation. In recent weeks Asian buyers purchased wheat from Australia and Argentina to replace delayed Black Sea cargoes, and those logistical difficulties drove Chicago futures sharply higher from the end of June.
Rosario lags the international rally
The recovery reached the Argentine market with considerably less intensity. In Rosario, spot soybeans reached $371.5 per tonne in mid-September against a three-year average of $329.8, or 12.6% above the mean. Corn traded at $201 per tonne versus an average of $190.2, just 5.7% higher, while wheat showed the smallest gap: $225.5 per tonne against a three-year average of $218, only 3.4% above its recent mean.
“While international quotations are 15.5% above the three-year average in soybeans, 22.6% in corn and 26.5% in wheat, in Rosario the differences are 12.6%, 5.7% and 3.4% respectively,” Bilbao noted. The gap is relatively narrow in soybeans but widens significantly in corn and, above all, in wheat, reflecting that Argentine price formation does not depend exclusively on Chicago.
