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Iowa corn triggered ARC-CO payments in 85 counties for the 2025 crop, while soybeans triggered them in 18. The 2026 enrollment window runs September 16 to December 11, and the ARC-CO guarantee rose from 86% to 90% of benchmark revenue.
Higher safety-net guarantees may influence how many acres growers keep in corn versus soybeans, which affects future supply. The near-term price effect is small.
After 1,646 past policy events, Corn moved a median +0.1% over 5 sessions (52% higher; middle half -1.3% to +1.5%), and +0.4% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.