When to plant in St. Simons, GA
USDA Zone 9aSt. Simons, Georgia frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
St. Simons enjoys a long ~320-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 St. Simons — most perennials thrive, and annual vegetables can go out early and stay late.
The average first fall frost in St. Simons is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
BRUNSWICK MALCOLM MCKINNON AP · 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 St. Simons’s own odds, recorded at BRUNSWICK MALCOLM MCKINNON AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 18 | Feb 27 | Feb 1 | Nov 16 | Dec 4 | Jan 1 |
| 32°F | Mar 6 | Feb 9 | Jan 11 | Nov 30 | Dec 26 | Jan 19 |
| 28°F | Feb 26 | Jan 27 | Dec 30 | Dec 13 | Jan 8 | Feb 7 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in St. Simons, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
St. Simons planting FAQ
When is the last spring frost in St. Simons, GA?
St. Simons's average last spring frost falls near February 9 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in St. Simons, GA?
The first fall frost in St. Simons typically arrives around December 26 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is St. Simons in?
St. Simons is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in St. Simons?
St. Simons has about 320 frost-free days — a long growing season — between the average last spring frost (February 9) and first fall frost (December 26).
When should I plant tomatoes in St. Simons?
For St. Simons, sow tomatoes indoors about December 15–December 29 and move the seedlings out around February 16, after the last spring frost.
Never miss a window in St. Simons
An email when it’s time to start seeds, transplant, and sow — timed to St. Simons’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Brunswick · 9 km
- St. Marys · 51 km
- Kingsland · 54 km
- Fernandina Beach · 58 km
- Yulee · 63 km
- Hinesville · 75 km
- Richmond Hill · 80 km
- Georgetown · 90 km
Frost dates recorded at BRUNSWICK MALCOLM MCKINNON AP, 3 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 St. Simons, GA — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00013878. Retrieved from https://blissgarden.com/georgia/st-simons.