Plant Sunflowers in Zone 10a
Seed-starting, transplant & harvest dates for USDA Zone 10a
Direct sow
Feb 7
Harvest (~80d)
Apr 28
In Zone 10a, the average last spring frost is around January. Sunflowers is a half-hardy crop, so sow it directly around the dates above.
Last spring frost
Jan 31
First fall frost
Dec 20
Growing season
323 days
Full Sunflowers grow guide → · All crops for Zone 10a →
Frequently asked questions
When should I start sunflowers in Zone 10a?
Direct sow outdoors around Feb 7.
Can I direct sow sunflowers in Zone 10a?
Yes, direct sow around Feb 7.