When to plant Swiss Chard in Zone 4b
In Zone 4b, Swiss Chard: direct sow outdoors around Apr 26–May 24. Expect to harvest around Jun 20–Jul 18.
| Step | When |
|---|---|
| Direct sow outdoors | Apr 26 – May 24 |
| Harvest | Jun 20 – Jul 18 |
Tip: Heat- and cold-tolerant; pick outer leaves and it keeps producing all season.
Zone 4b averages a last spring frost around May 10 and a first fall frost around Sep 22. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4b calendar in the tool →