Plant Sunflowers in Zone 9b
Seed-starting, transplant & harvest dates for USDA Zone 9b
Direct sow
Feb 22
Harvest (~80d)
May 13
In Zone 9b, the average last spring frost is around February. Sunflowers is a half-hardy crop, so sow it directly around the dates above.
Last spring frost
Feb 15
First fall frost
Dec 10
Growing season
298 days
Full Sunflowers grow guide → · All crops for Zone 9b →
Frequently asked questions
When should I start sunflowers in Zone 9b?
Direct sow outdoors around Feb 22.
Can I direct sow sunflowers in Zone 9b?
Yes, direct sow around Feb 22.