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Can You Grow Sunflower in Illinois?

US · USDA Zone 5b · zones 4a, 4b, 5a, 5b, 6a

Grows well here

Sunflowers grow brilliantly here — they love the warm season and produce quickly.

Plant zones

2a–11b

Illinois last frost

early April

Illinois first frost

late October

Days to harvest

60–80 days

When to plant Sunflowers in Illinois

Direct sow

Apr 7

Harvest

Jun 6 – Jun 26

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

About Sunflower

Sunflowers are fast-growing cheerful and attract pollinators — some varieties produce edible seeds.

Direct sow after last frost in the sunniest spot available. No transplanting needed. Giant varieties need staking. Harvest seed heads when the back turns brown and seeds are firm.

Full sunflower growing guide →

Gardening in Illinois

Illinois has a humid continental climate with hot summers and cold winters. Chicago is Zone 5b-6a; southern Illinois is warmer at Zone 6-7. Classic Midwest growing region.