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When to plant swiss chard in Zone 6b
In Zone 6b, direct-sow or transplant around April 2 – April 16. For a fall crop, sow around July 31 – August 14.
Your swiss chard timeline — Zone 6b
| Start indoors | February 26 – March 5 |
|---|---|
| Transplant | April 2 – April 16 |
| Sow for fall | July 31 – August 14 |
| Zone 6b last frost | ~04/23 |
| Zone 6b first frost | ~10/20 |
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 6b'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).