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Iowa corn trades within $0.05–$0.15/bu of CBOT futures (tight basis), with elevators concentrated along the I-80 corridor and Missouri River.
Corn is planted in Iowa from late April through late May, with harvest running from September through November. Spring and early summer price movements often reflect weather risk premium during pollination and grain fill.
Understanding Iowa Corn 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.
When and how to use basis in your marketing plan: Most Iowa corn producers use a combination of cash sales at harvest, hedge-to-arrive (HTA) contracts, and basis contracts to manage price risk. Forward contracting 20–30% of expected production before planting can lock in historically strong spring prices.
What Drives Iowa Corn Prices
- CBOT ZC Futures: The national price benchmark. Local cash prices = futures + basis. Watch nearby and deferred futures spreads (carry structure) to determine whether the market is rewarding or penalizing storage.
- USDA FAS Export Sales: Released every Thursday at 8:30am ET. Strong export commitments — especially to China — typically move futures and local bids within 24 hours.
- CFTC COT Positioning: Large speculative funds (managed money) net position in ZC futures is a 2–4 week leading indicator of price direction. Extreme net-short positions often precede short-covering rallies.
- Ethanol Crush Margin: Corn-ethanol crush profitability directly determines how aggressively ethanol plants bid for local corn. Negative crush = plants throttling back = weaker elevator bids.
- USDA WASDE Report: Monthly supply/demand revision. Carryout-to-use ratio changes of more than 5% typically move prices $0.10–$0.30/bu within minutes of the noon ET release.
- Weather: Drought stress (NOAA Drought Monitor D2+) during critical growth stages is historically the largest single-day market mover. Iowa producers should track Corn Belt drought coverage weekly May–August.