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When to plant swiss chard in Zone 3b
Your swiss chard timeline — Zone 3b
| Start indoors | March 25 – April 1 |
|---|---|
| Transplant | April 29 – May 13 |
| Zone 3b last frost | ~05/20 |
| Zone 3b first frost | ~09/19 |
Dates computed from Zone 3b'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 2026-08-28. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rule: University of New Hampshire Cooperative Extension — “Growing Vegetables: When to Plant Your Vegetable Garden”.