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When to plant swiss chard in Zone 4b
In Zone 4b, direct-sow or transplant around April 19 – May 3. For a fall crop, sow around July 11 – July 25.
Your swiss chard timeline — Zone 4b
| Start indoors | March 15 – March 22 |
|---|---|
| Transplant | April 19 – May 3 |
| Sow for fall | July 11 – July 25 |
| Zone 4b last frost | ~05/10 |
| Zone 4b first frost | ~09/30 |
Start indoors or direct-sow; set out / sow 2 weeks before the last frost. [src]Cited: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”
Dates computed from Zone 4b's median NOAA frost normals and the cited rule. Your town may differ by a week or two — check your exact ZIP.
What you'll need
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Last verified 2026-07-16. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rule: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”; UGA Extension (days to maturity).