When to plant sunflowers in zone 4

Sunflowers in USDA zone 4

Average zone 4 frost dates: last spring frost ≈ May 10, first fall frost ≈ Sep 25 (138 frost-free days). Local dates can vary by 2-3 weeks.

Direct sow after the last frost.

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Other zones

• Sunflowers in zone 3
• Sunflowers in zone 5
• Sunflowers in zone 6
• Sunflowers in zone 7
• Sunflowers in zone 8
• Sunflowers in zone 9
• Sunflowers in zone 10
• Zone 4 planting calendar