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Can You Grow Corn in Iowa?

US · USDA Zone 5a · zones 4a, 4b, 5a, 5b

Grows well here

Corn grows well here — plant in blocks after last frost for a summer harvest.

Plant zones

3b–11b

Iowa last frost

mid-April

Iowa first frost

mid-October

Days to harvest

60–90 days

When to plant Corn in Iowa

Direct sow

Apr 15

Harvest

Jun 14 – Jul 14

Dates are approximate, based on Iowa's average frost dates. Your exact yard may vary by microclimate.

About Corn

Corn needs space warmth and wind-pollination — plant in blocks not rows for good pollination.

Direct sow after soil reaches 16°C. Plant in a 4x4 block minimum for wind pollination. Needs consistent water especially during tasselling. Not suitable for containers.

Full corn growing guide →

Gardening in Iowa

Iowa has a humid continental climate with cold winters and warm summers. Most of the state is Zone 5a-5b. Excellent for cool-season crops and hardy fruits.