What Determines Iowa Grain Basis
Iowa typically runs a 5–20¢ negative basis on corn, meaning cash prices are 5–20¢ below CME December futures. Harvest lows typically hit October–November.
How to Use Basis in Your Grain Marketing Plan
When Iowa basis strengthens (cash rising relative to futures), local demand is outpacing local supply. This is often the best window for cash sales or HTA contract execution. Basis is compensating you for your geographic location — don't leave it on the table.
When Iowa basis weakens, local supply is exceeding local demand. Consider on-farm storage or a basis contract (locks in basis without pricing futures) if you expect basis to recover as the marketing year progresses and local demand firms up.
Seasonal Basis Patterns in Iowa
Basis in Iowa typically follows a predictable seasonal pattern. Corn and soybean basis is usually weakest at or shortly after harvest (September–November) when local supply peaks. Basis tends to strengthen through winter and spring as local stocks decline and elevator demand builds ahead of the next crop year.
The best cash grain sales for Iowa producers historically occur in one of two windows: (1) pre-harvest new-crop forwards if basis is historically strong, or (2) January–March when bin-run stocks are tight and elevators compete aggressively for remaining inventory.
Elevator Infrastructure in Iowa
Key Iowa elevators: Cargill Iowa Falls, ADM Iowa, Heartland Co-op, West Central Cooperative.
Get Weekly Basis Alerts for Iowa
GrainBrief monitors USDA AMS elevator bids daily and sends you a basis trend alert when Iowa basis moves more than 10¢ in a week — the threshold that historically signals a marketing opportunity.
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