Leeks planting windows by zone
| Zone | Main planting window | |
|---|---|---|
| Zone 1 | May 18 – Jun 1 | transplant outdoors |
| Zone 2 | May 2 – May 16 | transplant outdoors |
| Zone 3 | Apr 17 – May 1 | transplant outdoors |
| Zone 4 | Apr 7 – Apr 21 | transplant outdoors |
| Zone 5 | Mar 25 – Apr 8 | transplant outdoors |
| Zone 6 | Mar 13 – Mar 27 | transplant outdoors |
| Zone 7 | Mar 2 – Mar 16 | transplant outdoors |
| Zone 8 | Feb 15 – Mar 1 | transplant outdoors |
| Zone 9 | Jan 23 – Feb 6 | transplant outdoors |
| Zone 10 | Dec 28 – Jan 11 | transplant outdoors |
| Zone 11 | Coolest months (Oct–Mar) | frost-free |
| Zone 12 | Coolest months (Oct–Mar) | frost-free |
| Zone 13 | Coolest months (Oct–Mar) | frost-free |
Each zone link above has the complete schedule — indoor seed-starting, 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.