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Can You Grow Collard Greens in Iowa?

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

Grows well here

Collards are well-suited to your zone — they handle summer heat and frost alike.

Plant zones

5a–11b

Iowa last frost

mid-April

Iowa first frost

mid-October

Days to harvest

60–80 days

When to plant Collard Greenses in Iowa

Start indoors

Mar 18

Transplant

Apr 15

Harvest

Jun 14 – Jul 4

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

About Collard Greens

Collard greens are a Southern staple — extremely hardy, tolerating both frost and summer heat better than most brassicas. Rich in nutrients and one of the most productive greens per square foot.

Start indoors 4-6 weeks before last frost or direct sow. Harvest lower leaves as needed. Plants withstand hard frosts — flavor improves after cold snaps. In warm zones, grow as a fall/winter crop.

Full collard greens 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.