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The CBOT December corn contract settled up 8 cents at $3.54-1/4 per bushel after reaching $3.56-1/2, its highest since Oct. 31.
Chart-based buying noted as the contract broke through its 100- and 20-day moving averages.
Analysts surveyed by Reuters on average expected the USDA in its monthly reports on Wednesday to trim its estimates of US corn production and 2016/17 ending stocks.
The USDA said the US corn harvest was 86 percent complete by Sunday, slightly ahead of the five-year average of 85 percent.