The most active corn contract Cv1 on the Chicago Board of Trade ended the overnight session up 0.6% at $4.92-1/4 a bushel after touching its highest since April last year at $4.93.
CBOT soybeans Sv1 were up 0.9% at $12.27 a bushel, having earlier hit their highest since July 27 at $12.27-1/4.
South Dakota's corn yield prospects and soybean pod counts are lower than last year and the three-year average, scouts on an annual tour of top U.S. producing states found on Monday.
"The key question now is whether this weakness extends into the core Corn Belt," commodity data firm CM Navigator said in a note.
The Pro Farmer field tour is being closely watched after the U.S. Department of Agriculture cut its corn and soybean yield forecasts last week and following heavy rain that left some Midwest fields soggy.
The USDA also lowered its condition ratings for the nation's corn and soybean crops in a weekly report on Monday, though the cut was in line with trade expectations.
Mixed indications for yields have unsettled the market given expectations for strong demand.
National Oilseed Processors Association data showed NOPA members, which account for nearly all soybeans crushed in the United States, processed 216.647 million bushels of soybeans last month, up 1.1% from June and up 10.7% from July 2025.
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