August 15, 2025
Corn & Soybean Basis Weakens as Focus Shifts to New Crop
by Josh Strine
On Tuesday, the August WASDE report was released, which significantly increased the projected 25/26 corn supply and decreased the soybean supply. There were immediate effects in the futures market. September and December corn futures dropped by $0.13/bu, and September and November soybean futures increased by $0.21/bu. As we approach harvest, it is yet to be seen how this will affect the new crop basis. However, 24/25 corn and soybean basis to September futures were stable to only slightly weaker between the first two weeks of August. This follows a trend of recent weakening, which is in line with the historically suggested trend.
Over the past four weeks, corn basis across the Eastern Corn Belt has consistently decreased. Figure 1 depicts the change in West Central Indiana, which has resulted in a $0.13/bu weakening. This recent trend is unsurprising, given the three-year historical average, and may continue over the final two weeks in August. Since the beginning of August, soybean basis across the region has also experienced weakening. For example, the West Central Indiana soybean basis has decreased by $0.11/bu since the end of July (Figure 2). However, the two-year historic average suggests an opportunity for slight basis strengthening over the next two weeks.
Figure 1. Corn Basis, September Contract for West Central Indiana
Figure 2. Soybean Basis, September Contract for West Central Indiana
Trends in basis at ethanol plants and soybean processors have followed those of the regional corn and soybean basis. The historic averages also suggest similar changes as the marketing year comes to a close. On the other hand, the corn and soybean basis at Ohio River delivery points have slightly different outlooks than the rest of the markets across the Eastern Corn Belt. Figures 3 and 4 suggest there is an opportunity for Corn basis to slightly recover over the next two weeks, while soybean basis may continue to decline over the next two weeks. However, based on the historical average, potential basis gains are minimal, and the highest basis of the year has already passed.
Figure 3. Ohio River Corn Basis, September Contract
Figure 4. Ohio River Soybean Basis, September Contract
As the marketing year comes to a close, you can visit the Purdue Center for Commercial Agriculture’s Crop Basis Tool to see how your local crop basis has evolved over the past year. In September, we will look back at the full 24/25 marketing year, examine how the most recent year will move the historic average, and get a first look at the 25/26 corn and soybean basis.
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