When to Plant Sunflowers in Kentucky
Few things bring more joy than a row of sunflowers turning their faces to the sun. Easy, dramatic, and pollinator-friendly.
The Short Answer
Kentucky Frost Dates
Your planting dates depend on which part of Kentucky you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Northern Kentucky | 6a, 6b | Apr 15 - May 1 | Oct 5 - Oct 20 |
| Central Kentucky | 6b | Apr 10 - Apr 25 | Oct 10 - Oct 25 |
| Western Kentucky | 6b, 7a | Apr 5 - Apr 20 | Oct 15 - Nov 1 |
Sunflowers Planting Schedule for Kentucky
Northern Kentucky (Zones 6a, 6b)
Average last frost: Apr 15 - May 1 · Average first frost: Oct 5 - Oct 20
Central Kentucky (Zones 6b)
Average last frost: Apr 10 - Apr 25 · Average first frost: Oct 10 - Oct 25
Western Kentucky (Zones 6b, 7a)
Average last frost: Apr 5 - Apr 20 · Average first frost: Oct 15 - Nov 1
Growing Sunflowers in Kentucky
Sunflowers in Kentucky's Climate
Sunflowers are nearly foolproof in moderate climates. Direct sow after frost and watch them grow a foot or more per week in the summer heat. Succession plant every 2 weeks through late June for blooms all summer. Your reliable warm season gives even the tallest mammoth varieties plenty of time to mature.
Soil Considerations for Kentucky
Clay soils over limestone bedrock. Naturally alkaline. Good for many vegetables with amendment. Excellent for root crops in some areas. Make sure soil has warmed to at least 55°F before planting sunflowers outside.
Kentucky Climate & Growing Season
Mild, four-season climate. Adequate rainfall. Hot, humid summers. Good growing season. 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 Kentucky: Northern Kentucky (6a, 6b) has a last frost around Apr 15 - May 1, while Western Kentucky (6b, 7a) sees frost end around Apr 5 - Apr 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