Annual Flower

When to Plant Cosmos in Virginia

Delicate, daisy-like blooms that dance in the breeze. Cosmos thrive in poor soil and practically grow themselves.

The Short Answer

Cosmos thrive in Virginia's warm summers with zero maintenance, providing graceful cut flowers and pollinator habitat from June through frost.

Virginia Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Mountain Virginia 5b, 6a May 1 - May 15 Sep 25 - Oct 10
Piedmont/Central Virginia 7a, 7b Apr 5 - Apr 20 Oct 15 - Nov 1
Tidewater/Coastal 7b, 8a Mar 20 - Apr 5 Oct 25 - Nov 10

Cosmos Planting Schedule for Virginia

Mountain Virginia (Zones 5b, 6a)

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

Start Seeds Indoors
4 wks before frost
Transplant Outside
1 wks after frost
Direct Sow
1 wks after frost

Piedmont/Central Virginia (Zones 7a, 7b)

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

Start Seeds Indoors
4 wks before frost
Transplant Outside
1 wks after frost
Direct Sow
1 wks after frost

Tidewater/Coastal (Zones 7b, 8a)

Average last frost: Mar 20 - Apr 5 · Average first frost: Oct 25 - Nov 10

Start Seeds Indoors
4 wks before frost
Transplant Outside
1 wks after frost
Direct Sow
1 wks after frost

Growing Cosmos in Virginia

State-Specific Growing Tips

Direct sow from early May. Poor soil, full sun. Self-seeds freely for subsequent years.

Recommended Varieties for Virginia

Sensation Mix, Bright Lights, Double Click. All varieties work statewide.

Common Challenges in Virginia

Essentially trouble-free in Virginia.

Growing Tips

Don't over-fertilize — rich soil produces more leaves and fewer flowers. Let some flowers go to seed for next year's crop.

Companion Planting

Plant cosmos alongside these companions for better growth:

Tomatoes Squash

The Bottom Line

Cosmos can be grown successfully in Virginia with proper attention to regional frost dates and local growing conditions. Timing varies across the state — Mountain Virginia gardeners work with a last frost around May 1 - May 15, while Tidewater/Coastal sees frost end around Mar 20 - Apr 5. Choose varieties suited to your region, amend your soil based on its specific needs, and monitor for the pests and diseases most common in your area. For exact dates based on your zip code, use our free planting date finder.

Related Guides

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