Sunflowers planting windows by zone
| Zone | Main planting window | |
|---|---|---|
| Zone 1 | Jun 22 – Jun 29 | direct sow |
| Zone 2 | Jun 6 – Jun 13 | direct sow |
| Zone 3 | May 22 – May 29 | direct sow |
| Zone 4 | May 12 – May 19 | direct sow |
| Zone 5 | Apr 29 – May 6 | direct sow |
| Zone 6 | Apr 17 – Apr 24 | direct sow |
| Zone 7 | Apr 6 – Apr 13 | direct sow |
| Zone 8 | Mar 22 – Mar 29 | direct sow |
| Zone 9 | Feb 27 – Mar 6 | direct sow |
| Zone 10 | Feb 1 – Feb 8 | direct sow |
| Zone 11 | Nearly year-round | frost-free |
| Zone 12 | Nearly year-round | frost-free |
| Zone 13 | Nearly year-round | frost-free |
Each zone link above has the complete schedule — direct sowing, and season-fit notes. Zone dates are typical medians; for windows built on your own city's frost dates, use the frost date lookup and planting calendar.