Swiss Chard planting windows by zone
| Zone | Main planting window | |
|---|---|---|
| Zone 1 | Jun 1 – Jun 15 | transplant outdoors |
| Zone 2 | May 16 – May 30 | transplant outdoors |
| Zone 3 | May 1 – May 15 | transplant outdoors |
| Zone 4 | Apr 21 – May 5 | transplant outdoors |
| Zone 5 | Apr 8 – Apr 22 | transplant outdoors |
| Zone 6 | Mar 27 – Apr 10 | transplant outdoors |
| Zone 7 | Mar 16 – Mar 30 | transplant outdoors |
| Zone 8 | Mar 1 – Mar 15 | transplant outdoors |
| Zone 9 | Feb 6 – Feb 20 | transplant outdoors |
| Zone 10 | Jan 11 – Jan 25 | 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, direct sowing, fall planting, 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.