Grain traders expect to see highs in the spring and lows in the fall, but the following charts show that November Soybeans have a tendency to put in their yearly highs in either June or into the delivery month. December Corn highs are most prevalent in June, but in some years the market has a tendency to post highs right into the expiration month. It makes sense that highs would come in during June (usually late in the month), as market uncertainty over yield reaches a peak around that time. Highs occur late in the year when actual production comes in well below expectations. It is rare to see highs in February, April or May. March highs occur when low prospective acreage or stocks reports spark a rally.