Plant Sunflowers in Zone 6b
Seed-starting, transplant & harvest dates for USDA Zone 6b
Direct sow
Apr 22
Harvest (~80d)
Jul 11
In Zone 6b, the average last spring frost is around April. Sunflowers is a half-hardy crop, so sow it directly around the dates above.
Last spring frost
Apr 15
First fall frost
Oct 18
Growing season
186 days
Full Sunflowers grow guide → · All crops for Zone 6b →
Frequently asked questions
When should I start sunflowers in Zone 6b?
Direct sow outdoors around Apr 22.
Can I direct sow sunflowers in Zone 6b?
Yes, direct sow around Apr 22.