When to plant corn

Plant corn when the soil at planting depth is about 50°F (10°C) and not expected to drop much below that for the next 48 hours.

The window: Soil temperature at planting depth of 50°F (10°C), with a two-day (48-hour) window when it does not drop much below 50°F; in Indiana, daily soil-GDD accumulations begin to consistently average 10 or more per day in the second week of April in the southern third of the state, the third week of April in the central part, and the last week of April in the northern third.

Soil temperature at planting depth is about 50°F (10°C).
The soil is not expected to drop much below 50°F for the next 48 hours.
Daily soil-GDD accumulations are consistently averaging 10 or more per day.
For corn to emerge 10 days after planting, daily average soil temperatures are about 61-62°F.

The mistake to avoid: Planting into cold soil (below 50°F) when cold conditions are expected for the next 48 hours can lead to germination problems and seedlings not emerging or not emerging well.

Timing varies by region and year; your local extension office is the closest authority.

Grounded in: agry.purdue.edu, cropwatch.unl.edu. Every window and number follows sentences verified verbatim on those pages.

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