Warm-Season Vegetable

When to Plant Eggplant in Iowa

Beautiful purple fruits that love heat even more than tomatoes. Start early indoors for best results.

The Short Answer

In Iowa, eggplant planting dates vary by region. In Northern Iowa, your average last frost is around May 5 - May 20, while Southern Iowa sees its last frost around Apr 20 - May 5. Since eggplant are frost-sensitive, start seeds indoors 8 weeks before your last frost, then transplant outside 3 weeks after frost danger has passed. Outstanding black prairie soils. Some of the richest agricultural land in the world. Minimal amendment needed.

Iowa Frost Dates

Your planting dates depend on which part of Iowa you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Iowa 4b, 5a May 5 - May 20 Sep 20 - Oct 5
Central Iowa 5a, 5b Apr 25 - May 10 Oct 1 - Oct 15
Southern Iowa 5b Apr 20 - May 5 Oct 5 - Oct 20

Eggplant Planting Schedule for Iowa

Northern Iowa (Zones 4b, 5a)

Average last frost: May 5 - May 20 · Average first frost: Sep 20 - Oct 5

Start Seeds Indoors
8 wks before frost
Transplant Outside
3 wks after frost

Central Iowa (Zones 5a, 5b)

Average last frost: Apr 25 - May 10 · Average first frost: Oct 1 - Oct 15

Start Seeds Indoors
8 wks before frost
Transplant Outside
3 wks after frost

Southern Iowa (Zones 5b)

Average last frost: Apr 20 - May 5 · Average first frost: Oct 5 - Oct 20

Start Seeds Indoors
8 wks before frost
Transplant Outside
3 wks after frost

Growing Eggplant in Iowa

Eggplant in Iowa's Climate

Eggplant is one of the trickiest warm-season crops for cold climates — it demands even more heat than peppers. Asian varieties (Ichiban, Orient Express, 55-58 days) are the only reliable choice. Start indoors 10 weeks before last frost. Black plastic mulch and row cover are both necessary. Container growing on sun-baked pavement sometimes outproduces in-ground planting.

Soil Considerations for Iowa

Outstanding black prairie soils. Some of the richest agricultural land in the world. Minimal amendment needed. Make sure soil has warmed to at least 70°F before planting eggplant outside.

Iowa Climate & Growing Season

Continental climate. Cold winters, warm humid summers. Good growing season with adequate rainfall. Eggplant cannot tolerate any frost, so wait until all frost danger has passed before transplanting outside. Watch local forecasts carefully in spring.

Growing season length varies across Iowa: Northern Iowa (4b, 5a) has a last frost around May 5 - May 20, while Southern Iowa (5b) sees frost end around Apr 20 - May 5. This difference matters for eggplant — transplant timing shifts by several weeks across the state.

Growing Tips

Harvest when skin is glossy and firm. Dull skin means overripe and seedy. Use row covers if nights are cool.

Companion Planting

Plant eggplant alongside these companions for better growth:

Peppers Beans Marigolds

Keep eggplant away from:

Fennel

The Bottom Line

Eggplant can be grown successfully across Iowa, but your exact planting dates depend on which region you're in. Northern Iowa gardeners should plan around a May 5 - May 20 last frost, while those in Southern Iowa can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Eggplant Growing Guide National planting guide with all states Iowa Planting Calendar All plants for Iowa Eggplant in Alabama Alabama planting dates Eggplant in Alaska Alaska planting dates Eggplant in Arizona Arizona planting dates Eggplant in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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