Plant Sunflowers in Zone 9a
Seed-starting, transplant & harvest dates for USDA Zone 9a
Direct sow
Mar 8
Harvest (~80d)
May 27
In Zone 9a, the average last spring frost is around March. Sunflowers is a half-hardy crop, so sow it directly around the dates above.
Last spring frost
Mar 1
First fall frost
Nov 30
Growing season
274 days
Full Sunflowers grow guide → · All crops for Zone 9a →
Frequently asked questions
When should I start sunflowers in Zone 9a?
Direct sow outdoors around Mar 8.
Can I direct sow sunflowers in Zone 9a?
Yes, direct sow around Mar 8.