When to plant in Mount Pleasant, SC
USDA Zone 9aMount Pleasant, South Carolina frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Mount Pleasant enjoys a long ~262-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. In zone 9a, frost is a minor factor for Mount Pleasant — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
SULLIVANS IS · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Mount Pleasant’s own odds, recorded at SULLIVANS IS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 10 | Mar 25 | Mar 6 | Nov 1 | Nov 16 | Dec 5 |
| 32°F | Mar 30 | Mar 13 | Feb 19 | Nov 11 | Nov 30 | Dec 24 |
| 28°F | Mar 22 | Mar 1 | Feb 1 | Nov 25 | Dec 16 | Jan 10 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Mount Pleasant, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 19 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Mount Pleasant planting FAQ
When is the last spring frost in Mount Pleasant, SC?
On average, the last spring frost in Mount Pleasant is around March 13 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Mount Pleasant, SC?
The first fall frost in Mount Pleasant typically arrives around November 30 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Mount Pleasant in?
Mount Pleasant is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Mount Pleasant?
Mount Pleasant has about 262 frost-free days — a long growing season — between the average last spring frost (March 13) and first fall frost (November 30).
When should I plant tomatoes in Mount Pleasant?
For Mount Pleasant, sow tomatoes indoors about January 16–January 30 and move the seedlings out around March 20, after the last spring frost.
Never miss a window in Mount Pleasant
An email when it’s time to start seeds, transplant, and sow — timed to Mount Pleasant’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Charleston · 10 km
- James Island · 10 km
- Hanahan · 19 km
- North Charleston · 22 km
- Goose Creek · 25 km
- Ladson · 32 km
- Summerville · 37 km
- Moncks Corner · 45 km
Frost dates recorded at SULLIVANS IS, 5 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Mount Pleasant, SC — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00388405. Retrieved from https://blissgarden.com/south-carolina/mount-pleasant.