Last spring frost
Mar 22
Frost Dates for Barnwell, SC
First fall frost
Nov 9
Growing season
233 days
Hardiness zone
8b
In an average year around Barnwell, SC, the last spring frost (32°F) is about Mar 22 and the first fall frost is about Nov 9, giving roughly a 233-day growing season. To be safe most years, wait until Mar 1 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) | Apr 20 | Apr 4 | Mar 19 |
| Freeze (32°F) | Apr 9 | Mar 22 | Mar 1 |
| Hard (28°F) | Mar 27 | Mar 8 | Feb 11 |
| Severe (24°F) | Mar 17 | Feb 17 | Jan 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 15 | Apr 11 | Apr 7 | Apr 4 | Apr 1 | Mar 29 | Mar 24 | Mar 19 |
| 32°F | Apr 9 | Apr 3 | Mar 30 | Mar 26 | Mar 22 | Mar 18 | Mar 15 | Mar 9 | Mar 1 |
| 28°F | Mar 27 | Mar 22 | Mar 18 | Mar 13 | Mar 8 | Mar 4 | Feb 28 | Feb 21 | Feb 11 |
| 24°F | Mar 17 | Mar 10 | Mar 2 | Feb 26 | Feb 17 | Feb 10 | Feb 3 | Jan 30 | Jan 19 |
| 20°F | Mar 4 | Feb 21 | Feb 11 | Feb 4 | Jan 31 | Jan 27 | Jan 19 | Jan 12 | Dec 30 |
| 16°F | Feb 16 | Feb 5 | Jan 31 | Jan 27 | Jan 21 | Jan 15 | Jan 10 | Jan 3 | Dec 25 |
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) | Oct 20 | Nov 1 | Nov 14 |
| Freeze (32°F) | Oct 30 | Nov 9 | Nov 25 |
| Hard (28°F) | Nov 6 | Nov 20 | Dec 16 |
| Severe (24°F) | Nov 16 | Dec 7 | Jan 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 20 | Oct 25 | Oct 28 | Oct 31 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 14 |
| 32°F | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 9 | Nov 12 | Nov 15 | Nov 19 | Nov 25 |
| 28°F | Nov 6 | Nov 10 | Nov 14 | Nov 17 | Nov 20 | Nov 24 | Nov 30 | Dec 5 | Dec 16 |
| 24°F | Nov 16 | Nov 22 | Nov 27 | Dec 2 | Dec 7 | Dec 18 | Dec 27 | Jan 3 | Jan 12 |
| 20°F | Nov 28 | Dec 6 | Dec 16 | Dec 26 | Jan 1 | Jan 6 | Jan 12 | Jan 17 | Feb 1 |
| 16°F | Dec 13 | Dec 24 | Jan 1 | Jan 5 | Jan 10 | Jan 14 | Jan 20 | Jan 28 | Feb 4 |
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: Barnwell 5 Ene, Sc, about 9 miles away@if(!empty($station['elevation_ft'])), at 245 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 Barnwell, SC?
On average, the last spring frost (32°F) around Barnwell, SC is about Mar 22. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 1.
When is the first frost in the fall?
The first fall frost around Barnwell, SC typically arrives about Nov 9. 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 Mar 22 on average, or Mar 1 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 233 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 29812 Planting calendar → South Carolina frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026