Last spring frost
Mar 21
Frost Dates for Seneca, SC
First fall frost
Nov 11
Growing season
236 days
Hardiness zone
8b
In an average year around Seneca, SC, the last spring frost (32°F) is about Mar 21 and the first fall frost is about Nov 11, giving roughly a 236-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 19 | Apr 3 | Mar 18 |
| Freeze (32°F) | Apr 7 | Mar 21 | Mar 1 |
| Hard (28°F) | Mar 24 | Mar 7 | Feb 10 |
| Severe (24°F) | Mar 15 | Feb 19 | Jan 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 19 | Apr 14 | Apr 10 | Apr 6 | Apr 3 | Apr 1 | Mar 28 | Mar 24 | Mar 18 |
| 32°F | Apr 7 | Apr 1 | Mar 28 | Mar 25 | Mar 21 | Mar 18 | Mar 14 | Mar 8 | Mar 1 |
| 28°F | Mar 24 | Mar 18 | Mar 15 | Mar 11 | Mar 7 | Mar 2 | Feb 26 | Feb 20 | Feb 10 |
| 24°F | Mar 15 | Mar 7 | Mar 1 | Feb 24 | Feb 19 | Feb 13 | Feb 5 | Jan 30 | Jan 19 |
| 20°F | Mar 4 | Feb 22 | Feb 13 | Feb 6 | Jan 31 | Jan 27 | Jan 21 | Jan 14 | Jan 4 |
| 16°F | Feb 18 | Feb 7 | Feb 1 | Jan 29 | Jan 24 | Jan 18 | Jan 14 | Jan 7 | Dec 31 |
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 19 | Nov 1 | Nov 15 |
| Freeze (32°F) | Oct 28 | Nov 11 | Dec 1 |
| Hard (28°F) | Nov 8 | Nov 27 | Dec 21 |
| Severe (24°F) | Nov 21 | Dec 14 | Jan 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 19 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 10 | Nov 15 |
| 32°F | Oct 28 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 15 | Nov 19 | Nov 24 | Dec 1 |
| 28°F | Nov 8 | Nov 13 | Nov 18 | Nov 22 | Nov 27 | Dec 1 | Dec 5 | Dec 10 | Dec 21 |
| 24°F | Nov 21 | Nov 29 | Dec 4 | Dec 8 | Dec 14 | Dec 23 | Dec 29 | Jan 3 | Jan 13 |
| 20°F | Dec 7 | Dec 15 | Dec 24 | Dec 29 | Jan 2 | Jan 7 | Jan 13 | Jan 19 | Jan 30 |
| 16°F | Dec 21 | Dec 30 | Jan 2 | Jan 6 | Jan 12 | Jan 16 | Jan 20 | Jan 28 | Feb 5 |
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: Clemson Oconee Co Ap, Sc, about 3.9 miles away@if(!empty($station['elevation_ft'])), at 891 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 Seneca, SC?
On average, the last spring frost (32°F) around Seneca, SC is about Mar 21. 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 Seneca, SC typically arrives about Nov 11. 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 21 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 236 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 29678 Planting calendar → South Carolina frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026