Annual Flower

When to Plant Cosmos in Arkansas

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

The Short Answer

In Arkansas, plant cosmos based on your regional frost dates. Northern Arkansas has a last frost around Apr 5 - Apr 20, while Southern Arkansas sees frost end around Mar 15 - Apr 1. Hot, humid summers. Moderate winters. Good growing conditions for most vegetables.

Arkansas Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Arkansas 6b, 7a Apr 5 - Apr 20 Oct 10 - Oct 25
Central Arkansas 7a, 7b Mar 25 - Apr 10 Oct 20 - Nov 5
Southern Arkansas 7b, 8a Mar 15 - Apr 1 Nov 1 - Nov 15

Cosmos Planting Schedule for Arkansas

Northern Arkansas (Zones 6b, 7a)

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

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

Central Arkansas (Zones 7a, 7b)

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

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

Southern Arkansas (Zones 7b, 8a)

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

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

Growing Cosmos in Arkansas

Cosmos in Arkansas's Climate

Cosmos love your heat and sun. Plant from March and enjoy blooms for 6+ months. They handle drought well — one of the most water-efficient flowers for warm-climate gardens. Let some flowers go to seed for naturalized volunteer displays in subsequent years.

Soil Considerations for Arkansas

Heavy clay in lowlands. Rocky soil in Ozarks. Raised beds recommended for drainage. Make sure soil has warmed to at least 60°F before planting cosmos outside.

Arkansas Climate & Growing Season

Hot, humid summers. Moderate winters. Good growing conditions for most vegetables. Cosmos 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 Arkansas: Northern Arkansas (6b, 7a) has a last frost around Apr 5 - Apr 20, while Southern Arkansas (7b, 8a) sees frost end around Mar 15 - Apr 1. This difference matters for cosmos — transplant timing shifts by several weeks across the state.

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 across Arkansas, but your exact planting dates depend on which region you're in. Northern Arkansas gardeners should plan around a Apr 5 - Apr 20 last frost, while those in Southern Arkansas can typically plant earlier. 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 Arkansas Planting Calendar All plants for Arkansas Cosmos in Alabama Alabama planting dates Cosmos in Alaska Alaska planting dates Cosmos in Arizona Arizona 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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