Planting Date · Sunflower
Sunflower Planting Date Calculator
Calculate the optimal planting dates for sunflower based on your USDA zone, last frost date, and preferred start method.
Optimal Soil Temp
60°F
Days to Maturity
80 days
Frost Tolerance
tender
Planting Depth
1 inch
Input
Fill in the fields below, then click Calculate.
Select your USDA plant hardiness zone (3–10).
Approximate month of your last spring frost.
How you plan to start the crop.
No results yet
Fill in the fields and click Calculate to see results.
Tips & Best Practices
- Direct sow sunflowers 1 week after the last frost when soil is 60°F+.
- Sunflowers have deep taproots — do not transplant.
- Stagger planting every 2 weeks for blooms from summer through fall.
- Tall varieties may need staking in windy areas.