Perennial Flower

When to Plant Lavender in Illinois

Fragrant, drought-tolerant, and beloved by pollinators. Once established, lavender rewards you for years.

The Short Answer

In Illinois, plant lavender based on your regional frost dates. Northern Illinois (Chicago) has a last frost around Apr 25 - May 10, while Southern Illinois sees frost end around Apr 1 - Apr 15. Continental climate with four seasons. Hot, humid summers. Cold winters. Good growing season length in central and...

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

Lavender 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
10 wks before frost
Transplant Outside
2 wks after frost

Central Illinois (Zones 5b, 6a)

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

Start Seeds Indoors
10 wks before frost
Transplant Outside
2 wks after frost

Southern Illinois (Zones 6b, 7a)

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

Start Seeds Indoors
10 wks before frost
Transplant Outside
2 wks after frost

Growing Lavender in Illinois

Lavender in Illinois's Climate

Your climate supports lavender well with proper drainage. English and hybrid lavender (Phenomenal, Grosso) thrive in the neutral-to-alkaline soils common in limestone regions. The biggest mistake is overwatering — lavender is Mediterranean and prefers dry feet. Prune in spring after new growth appears, never into old wood.

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 lavender — adjust your planting dates to match your specific region.

Growing Tips

Needs excellent drainage — clay soil is lavender's enemy. Don't prune into old wood. English varieties (Lavandula angustifolia) are hardiest.

Companion Planting

Plant lavender alongside these companions for better growth:

Roses Thyme Sage

The Bottom Line

Lavender 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

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