Home › Crops › Thyme › Zone 4a
When to plant thyme in Zone 4a
In Zone 4a, start indoors around March 12 – March 26 and transplant around May 14 – May 28.
Your thyme timeline — Zone 4a
| Start indoors | March 12 – March 26 |
|---|---|
| Transplant | May 14 – May 28 |
| Zone 4a last frost | ~05/14 |
| Zone 4a first frost | ~09/27 |
Start indoors; set out 1 week after the last frost. [src]Cited: Johnny's Selected Seeds — Seed-Starting Date Calculator chart
Dates computed from Zone 4a'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
Affiliate links — as an Amazon Associate we may earn from qualifying purchases, at no extra cost to you.
Last verified 2026-07-17. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rule: Johnny's Selected Seeds — Seed-Starting Date Calculator chart.