Plant Sunflowers in Zone 5a
Seed-starting, transplant & harvest dates for USDA Zone 5a
Direct sow
May 7
Harvest (~80d)
Jul 26
In Zone 5a, 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 30
First fall frost
Oct 3
Growing season
156 days
Full Sunflowers grow guide → · All crops for Zone 5a →
Frequently asked questions
When should I start sunflowers in Zone 5a?
Direct sow outdoors around May 7.
Can I direct sow sunflowers in Zone 5a?
Yes, direct sow around May 7.