Last spring frost
Mar 1
Frost Dates for Seguin, TX
First fall frost
Nov 26
Growing season
273 days
Hardiness zone
9a
In an average year around Seguin, TX, the last spring frost (32°F) is about Mar 1 and the first fall frost is about Nov 26, giving roughly a 273-day growing season. To be safe most years, wait until Feb 3 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 3 | Mar 13 | Feb 23 |
| Freeze (32°F) | Mar 20 | Mar 1 | Feb 3 |
| Hard (28°F) | Mar 10 | Feb 13 | Jan 11 |
| Severe (24°F) | Mar 1 | Jan 26 | Dec 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 3 | Mar 29 | Mar 23 | Mar 18 | Mar 13 | Mar 10 | Mar 6 | Mar 1 | Feb 23 |
| 32°F | Mar 20 | Mar 13 | Mar 8 | Mar 5 | Mar 1 | Feb 25 | Feb 21 | Feb 15 | Feb 3 |
| 28°F | Mar 10 | Mar 3 | Feb 26 | Feb 20 | Feb 13 | Feb 7 | Jan 30 | Jan 23 | Jan 11 |
| 24°F | Mar 1 | Feb 19 | Feb 8 | Feb 1 | Jan 26 | Jan 20 | Jan 10 | Jan 2 | Dec 23 |
| 20°F | Feb 17 | Feb 4 | Jan 30 | Jan 22 | Jan 12 | Jan 6 | Jan 2 | Dec 29 | Dec 17 |
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 31 | Nov 15 | Dec 2 |
| Freeze (32°F) | Nov 8 | Nov 26 | Dec 20 |
| Hard (28°F) | Nov 18 | Dec 11 | Jan 16 |
| Severe (24°F) | Dec 2 | Jan 1 | Feb 3 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 31 | Nov 4 | Nov 8 | Nov 11 | Nov 15 | Nov 18 | Nov 22 | Nov 26 | Dec 2 |
| 32°F | Nov 8 | Nov 14 | Nov 18 | Nov 22 | Nov 26 | Dec 1 | Dec 4 | Dec 9 | Dec 20 |
| 28°F | Nov 18 | Nov 27 | Dec 1 | Dec 6 | Dec 11 | Dec 19 | Dec 28 | Jan 4 | Jan 16 |
| 24°F | Dec 2 | Dec 10 | Dec 18 | Dec 26 | Jan 1 | Jan 4 | Jan 10 | Jan 22 | Feb 3 |
| 20°F | Dec 12 | Dec 22 | Dec 29 | Jan 1 | Jan 5 | Jan 9 | Jan 18 | Feb 1 | Feb 8 |
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: Austin San Antonio, Tx, about 12.7 miles away@if(!empty($station['elevation_ft'])), at 633 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 Seguin, TX?
On average, the last spring frost (32°F) around Seguin, TX is about Mar 1. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 3.
When is the first frost in the fall?
The first fall frost around Seguin, TX typically arrives about Nov 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 Mar 1 on average, or Feb 3 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 273 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 78155 Planting calendar → Texas frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026