Last spring frost
Feb 9
Frost Dates for St. Simons, GA
First fall frost
Dec 26
Growing season
312 days
Hardiness zone
9a
In an average year around St. Simons, GA, the last spring frost (32°F) is about Feb 9 and the first fall frost is about Dec 26, giving roughly a 312-day growing season. To be safe most years, wait until Jan 11 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Mar 18 | Feb 27 | Feb 1 |
| Freeze (32°F) | Mar 6 | Feb 9 | Jan 11 |
| Hard (28°F) | Feb 26 | Jan 27 | Dec 30 |
| Severe (24°F) | Feb 14 | Jan 18 | Dec 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 18 | Mar 11 | Mar 6 | Mar 3 | Feb 27 | Feb 23 | Feb 17 | Feb 10 | Feb 1 |
| 32°F | Mar 6 | Feb 28 | Feb 23 | Feb 15 | Feb 9 | Feb 4 | Jan 30 | Jan 21 | Jan 11 |
| 28°F | Feb 26 | Feb 14 | Feb 6 | Jan 31 | Jan 27 | Jan 20 | Jan 14 | Jan 8 | Dec 30 |
| 24°F | Feb 14 | Feb 4 | Jan 30 | Jan 25 | Jan 18 | Jan 13 | Jan 8 | Jan 3 | Dec 28 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Nov 16 | Dec 4 | Jan 1 |
| Freeze (32°F) | Nov 30 | Dec 26 | Jan 19 |
| Hard (28°F) | Dec 13 | Jan 8 | Feb 7 |
| Severe (24°F) | Dec 21 | Jan 13 | Feb 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Nov 16 | Nov 22 | Nov 27 | Dec 1 | Dec 4 | Dec 8 | Dec 15 | Dec 22 | Jan 1 |
| 32°F | Nov 30 | Dec 6 | Dec 13 | Dec 20 | Dec 26 | Dec 31 | Jan 4 | Jan 9 | Jan 19 |
| 28°F | Dec 13 | Dec 24 | Dec 30 | Jan 3 | Jan 8 | Jan 13 | Jan 18 | Jan 27 | Feb 7 |
| 24°F | Dec 21 | Jan 1 | Jan 4 | Jan 8 | Jan 13 | Jan 19 | Jan 26 | Jan 31 | Feb 7 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Brunswick Malcolm Mckinnon Ap, Ga, about 7.8 miles away@if(!empty($station['elevation_ft'])), at 16 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in St. Simons, GA?
On average, the last spring frost (32°F) around St. Simons, GA is about Feb 9. In cooler years it can run later, so for a safer bet many gardeners wait until Jan 11.
When is the first frost in the fall?
The first fall frost around St. Simons, GA typically arrives about Dec 26. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Feb 9 on average, or Jan 11 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 312 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 31522 Planting calendar → Georgia frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026