South Carolina planting calendar

When to plant rosemary in South Carolina — sow, transplant & harvest dates

South Carolina is mostly USDA zone 8a (range 7a-9a). Dates below are derived from rosemary's frost tolerance and South Carolina's frost window — not generic national averages.

Rosemary planting timetable for South Carolina

Stage	When in South Carolina	Anchor
Start seeds indoors	mid-January (January 14)	10 weeks before the last frost (late March)
Transplant outside	early April (April 8)	14 days after the last frost (late March)
First harvest (estimate)	early July (July 7)	~90 days from transplant

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why South Carolina's climate shifts the rosemary dates

South Carolina's last spring frost averages late March and first fall frost early November, which sets the whole planting clock. South Carolina has a long, hot, humid season with mild winters. The coast is nearly frost-free; the upstate sees a brief cold spell. Wait for warm soil — rosemary stall in cold ground even after the air warms, so don't rush them out.

Start seeds indoors 10–12 weeks before the last frost; germination is slow and erratic (14–21 days at 18–21 °C / 65–70 °F) with low viability, so propagation by stem cuttings is preferred by most Extension services. Transplant outdoors after the last frost once soil has warmed — rosemary is perennial only in USDA zones 7–10 (established plants survive to about −12 °C / 10 °F); in zones 6 and colder treat as a tender annual or overwinter potted plants indoors before the first autumn frost. Tip harvests of stem ends begin around 80–100 days from transplant.

Frost-risk note

Don't plant before late March — a hard freeze can still set young plants back. In the Blue Ridge upstate near the mountains (zone 7a) the safe date runs a week or two later.

Regional variation within South Carolina

the Blue Ridge upstate near the mountains (zone 7a) runs roughly 1-2 weeks behind the state average; the Lowcountry coast around Charleston (zone 9a) can plant 1-2 weeks earlier.

Columbia — USDA zone 8b
Charleston — USDA zone 9a
Greenville — USDA zone 8a
Myrtle Beach — USDA zone 8b

What else to plant in South Carolina around then

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: 18–21 °C (65–70 °F).
Spacing: 18–36 inches (45–90 cm) between plants.
Days to harvest: ~90 days from planting out.

Frequently asked questions

When is the best time to plant rosemary in South Carolina?

In South Carolina (mostly USDA zone 8a), sow rosemary indoors around mid-January, transplant outdoors early April (after the last frost, late March), and harvest from early July. Rosemary are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

What USDA zone is South Carolina?

Most of South Carolina sits in USDA hardiness zone 8a, with the state spanning roughly 7a-9a from the Blue Ridge upstate near the mountains (zone 7a) to the Lowcountry coast around Charleston (zone 9a). The last spring frost averages late March and the first fall frost early November.

Can you grow rosemary in South Carolina?

Yes. South Carolina's dominant zone 8a supports rosemary — the key is timing. Rosemary are half-hardy — young plants shrug off a light frost but not a hard freeze, so sowing can start a couple of weeks before the last spring frost.

Does the planting date change across South Carolina?

the Blue Ridge upstate near the mountains (zone 7a) runs roughly 1-2 weeks behind the state average; the Lowcountry coast around Charleston (zone 9a) can plant 1-2 weeks earlier.

What else can I plant in South Carolina around the same time?

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.