Charleston, SC · zone 9a · ~329 frost-free days
When to plant in Charleston: frost dates and zone 9a.
In Charleston, the typical last spring frost lands around Feb 4 and the first fall frost around Dec 30, giving you about 329 frost-free days. Cool-season crops go out before the last frost; warm-season crops wait until after it.
The 2026 windows
Sow dates for Charleston, keyed to your frost.
| Crop | Start indoors | Spring sow / set out | Fall sow |
|---|---|---|---|
| Tomato, slicing | Dec 31 to Mar 2 | Feb 11 to Apr 13 | — |
| Lettuce, leaf | — | Dec 28 to Feb 11 | Oct 16 to Dec 15 |
| Carrot | — | Dec 28 to Jan 30 | Oct 4 to Oct 30 |
| Bush Bean | — | Feb 4 to Mar 27 | Sep 15 to Oct 18 |
| Cucumber, slicing | — | Feb 11 to May 13 | Aug 29 to Sep 29 |
| Pepper, bell | Jan 9 to Mar 2 | Feb 20 to Apr 13 | — |
| Kale | Nov 16 to Dec 14 | Dec 28 to Jan 25 | Sep 29 to Nov 14 |
| Spinach | — | Dec 14 to Jan 25 | Oct 16 to Dec 4 |
Charleston sits in Zone 9a, but two gardens in the same city can be a week or two apart. The planner works from your ZIP code's frost dates, not the zone, so the dates land right for your block, not the metro average.
Build your Charleston garden plan.
Tell the free planner what you want to eat and who you're feeding. It returns plant counts, spacing, and frost-safe sow dates for ZIP 29401 in about 60 seconds.
Charleston planting questions
What planting zone is Charleston, SC?+
Charleston is in USDA hardiness zone 9a. Growing zone, gardening zone, and planting zone all mean the same thing: the USDA number, 9a here. It tells you what survives winter, not when to plant. Frost dates set your planting time, and the free planner uses your exact ZIP code's frost dates, which can differ by weeks across one metro.
When is the last frost date in Charleston?+
The typical last spring frost in Charleston, SC is around Feb 4. That is an average from local history, not a guarantee, so tender crops like tomatoes and peppers are safer with a week of buffer after it.
When is the first frost date in Charleston?+
The typical first fall frost in Charleston, SC arrives around Dec 30, closing a growing season of roughly 329 frost-free days. Count backward from it to find the last date a fall crop can still finish.
What can I plant now in Charleston?+
It depends on the date. Cool-season crops like lettuce, kale, and spinach go out weeks before the last frost; warm-season crops like tomatoes and peppers wait until after Feb 4. The table above shows each crop's window; the free planner turns your ZIP into an exact, dated calendar.