When to plant Swiss Chard in Zone 4a
In Zone 4a, Swiss Chard: direct sow outdoors around May 1–May 29. Expect to harvest around Jun 25–Jul 23.
| Step | When |
|---|---|
| Direct sow outdoors | May 1 – May 29 |
| Harvest | Jun 25 – Jul 23 |
Tip: Heat- and cold-tolerant; pick outer leaves and it keeps producing all season.
Zone 4a averages a last spring frost around May 15 and a first fall frost around Sep 18. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4a calendar in the tool →