When to Plant Sunflowers in Louisiana
Few things bring more joy than a row of sunflowers turning their faces to the sun. Easy, dramatic, and pollinator-friendly.
The Short Answer
Louisiana Frost Dates
Your planting dates depend on which part of Louisiana you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Northern Louisiana | 8a, 8b | Mar 1 - Mar 15 | Nov 10 - Nov 25 |
| Southern Louisiana | 9a, 9b | Feb 1 - Feb 20 | Dec 1 - Dec 20 |
Sunflowers Planting Schedule for Louisiana
Northern Louisiana (Zones 8a, 8b)
Average last frost: Mar 1 - Mar 15 · Average first frost: Nov 10 - Nov 25
Southern Louisiana (Zones 9a, 9b)
Average last frost: Feb 1 - Feb 20 · Average first frost: Dec 1 - Dec 20
Growing Sunflowers in Louisiana
Sunflowers in Louisiana's Climate
Sunflowers love your heat and long days. Plant earlier than northern growers — from mid-March in many warm-zone areas. The intense sun produces vibrant colors and sturdy stalks. Multiple succession plantings can provide sunflower blooms from May through November.
Soil Considerations for Louisiana
Rich alluvial soils in river valleys. Heavy clay in many areas. Acidic throughout. Sandy in some coastal areas. Make sure soil has warmed to at least 55°F before planting sunflowers outside.
Louisiana Climate & Growing Season
Subtropical. Long growing season. Very hot and humid summers — some crops need shade. Year-round gardening possible. Sunflowers 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 Louisiana: Northern Louisiana (8a, 8b) has a last frost around Mar 1 - Mar 15, while Southern Louisiana (9a, 9b) sees frost end around Feb 1 - Feb 20. This difference matters for sunflowers — transplant timing shifts by several weeks across the state.
Growing Tips
Direct sow is preferred — sunflowers don't love transplanting. Succession plant every 2 weeks for blooms all summer.
Companion Planting
Plant sunflowers alongside these companions for better growth:
Keep sunflowers away from:
The Bottom Line
Last reviewed: March 29, 2026