Herb

When to Plant Parsley in Illinois

More than a garnish. Parsley is a biennial that produces abundantly its first year and is one of the most nutritious herbs.

The Short Answer

Parsley are planted in fall in Illinois, 8 weeks before your first frost date. That means planting around Oct 1 - Oct 15 in Northern Illinois (Chicago).

Illinois Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Illinois (Chicago) 5a, 5b Apr 25 - May 10 Oct 1 - Oct 15
Central Illinois 5b, 6a Apr 15 - May 1 Oct 5 - Oct 20
Southern Illinois 6b, 7a Apr 1 - Apr 15 Oct 15 - Nov 1

Parsley Planting Schedule for Illinois

Northern Illinois (Chicago) (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
2 wks before frost
Direct Sow
3 wks before frost
Fall Planting
8 wks before first frost

Central Illinois (Zones 5b, 6a)

Average last frost: Apr 15 - May 1 · Average first frost: Oct 5 - Oct 20

Start Seeds Indoors
8 wks before frost
Transplant Outside
2 wks before frost
Direct Sow
3 wks before frost
Fall Planting
8 wks before first frost

Southern Illinois (Zones 6b, 7a)

Average last frost: Apr 1 - Apr 15 · Average first frost: Oct 15 - Nov 1

Start Seeds Indoors
8 wks before frost
Transplant Outside
2 wks before frost
Direct Sow
3 wks before frost
Fall Planting
8 wks before first frost

Growing Parsley in Illinois

Parsley in Illinois's Climate

Parsley grows all season in your climate. Transplant from mid-April. The biennial rarely bolts in its first year, giving you months of continuous harvest. Fall parsley often survives winter under mulch in your milder microclimates for an even earlier start next spring.

Soil Considerations for Illinois

Rich prairie soils — some of the most fertile in the country. Heavy clay in many areas. Well-suited for most vegetables.

Illinois Climate & Growing Season

Continental climate with four seasons. Hot, humid summers. Cold winters. Good growing season length in central and southern regions.

Growing season length varies across Illinois: Northern Illinois (Chicago) (5a, 5b) has a last frost around Apr 25 - May 10, while Southern Illinois (6b, 7a) sees frost end around Apr 1 - Apr 15. This difference matters for parsley — adjust your planting dates to match your specific region.

Growing Tips

Parsley seeds are notoriously slow to germinate — soak overnight before planting. It's a biennial: lush leaves year one, seeds year two.

Companion Planting

Plant parsley alongside these companions for better growth:

Tomatoes Asparagus Corn

The Bottom Line

Parsley can be grown successfully across Illinois, but your exact planting dates depend on which region you're in. Northern Illinois (Chicago) gardeners should plan around a Apr 25 - May 10 last frost, while those in Southern Illinois can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Parsley Growing Guide National planting guide with all states Illinois Planting Calendar All plants for Illinois Parsley in Alabama Alabama planting dates Parsley in Alaska Alaska planting dates Parsley in Arizona Arizona planting dates Parsley 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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