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Can You Grow Cauliflower in Iowa?

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

Grows well here

Cauliflower grows well here if you time it for your cool season — fall crops are often more reliable than spring.

Plant zones

2a–11b

Iowa last frost

mid-April

Iowa first frost

mid-October

Days to harvest

60–100 days

When to plant Cauliflowers in Iowa

Start indoors

Mar 3

Transplant

Apr 15

Harvest

Jun 14 – Jul 24

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

About Cauliflower

Cauliflower is one of the most rewarding cool-season brassicas — and one of the trickiest. It forms a dense white head that needs steady cool weather and consistent moisture.

Start indoors 6 weeks before last frost; transplant 2-3 weeks before last frost. Blanch heads by tying leaves over them once they're 2-3 inches across. Harvest before curds loosen.

Full cauliflower 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.