Annual Flower

When to Plant Cosmos in Florida

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

The Short Answer

Cosmos grow in Florida during the drier months, adding easy color to fall-through-spring gardens.

Florida Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
North Florida 8a, 8b, 9a Feb 15 - Mar 10 Nov 15 - Dec 10
Central Florida 9a, 9b, 10a Jan 15 - Feb 10 Dec 10 - Jan 5
South Florida 10a, 10b, 11a Rare Rare

Cosmos Planting Schedule for Florida

North Florida (Zones 8a, 8b, 9a)

Average last frost: Feb 15 - Mar 10 · Average first frost: Nov 15 - Dec 10

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

Central Florida (Zones 9a, 9b, 10a)

Average last frost: Jan 15 - Feb 10 · Average first frost: Dec 10 - Jan 5

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

South Florida (Zones 10a, 10b, 11a)

Average last frost: Rare · Average first frost: Rare

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

Growing Cosmos in Florida

State-Specific Growing Tips

Sow October through March. Avoid summer humidity. Poor soil preferred. Full sun.

Recommended Varieties for Florida

Bright Lights (Cosmos sulphureus) handles humidity better than Cosmos bipinnatus. Sensation Mix for standard cosmos.

Common Challenges in Florida

Fungal diseases during humid periods. Best grown during the drier months.

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 Florida with proper attention to regional frost dates and local growing conditions. Timing varies across the state — North Florida gardeners work with a last frost around Feb 15 - Mar 10, while South Florida sees frost end around Rare. 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 Florida Planting Calendar All plants for Florida 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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