Last spring frost
Apr 2
Frost Dates for Trinity, AL
First fall frost
Oct 31
Growing season
209 days
Hardiness zone
8a
In an average year around Trinity, AL, the last spring frost (32°F) is about Apr 2 and the first fall frost is about Oct 31, giving roughly a 209-day growing season. To be safe most years, wait until Mar 17 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 28 | Apr 13 | Mar 29 |
| Freeze (32°F) | Apr 18 | Apr 2 | Mar 17 |
| Hard (28°F) | Apr 7 | Mar 23 | Mar 1 |
| Severe (24°F) | Mar 27 | Mar 7 | Feb 15 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 28 | Apr 24 | Apr 20 | Apr 16 | Apr 13 | Apr 10 | Apr 6 | Apr 2 | Mar 29 |
| 32°F | Apr 18 | Apr 12 | Apr 8 | Apr 5 | Apr 2 | Mar 31 | Mar 27 | Mar 23 | Mar 17 |
| 28°F | Apr 7 | Apr 3 | Mar 30 | Mar 26 | Mar 23 | Mar 19 | Mar 14 | Mar 8 | Mar 1 |
| 24°F | Mar 27 | Mar 21 | Mar 16 | Mar 11 | Mar 7 | Mar 3 | Feb 27 | Feb 23 | Feb 15 |
| 20°F | Mar 15 | Mar 7 | Mar 2 | Feb 26 | Feb 22 | Feb 17 | Feb 11 | Feb 4 | Jan 29 |
| 16°F | Mar 6 | Feb 25 | Feb 18 | Feb 11 | Feb 6 | Feb 1 | Jan 28 | Jan 20 | Jan 9 |
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 8 | Oct 21 | Nov 1 |
| Freeze (32°F) | Oct 18 | Oct 31 | Nov 14 |
| Hard (28°F) | Oct 27 | Nov 8 | Nov 29 |
| Severe (24°F) | Nov 4 | Nov 21 | Dec 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 8 | Oct 13 | Oct 17 | Oct 19 | Oct 21 | Oct 23 | Oct 26 | Oct 28 | Nov 1 |
| 32°F | Oct 18 | Oct 22 | Oct 25 | Oct 28 | Oct 31 | Nov 1 | Nov 4 | Nov 7 | Nov 14 |
| 28°F | Oct 27 | Nov 1 | Nov 2 | Nov 5 | Nov 8 | Nov 12 | Nov 16 | Nov 21 | Nov 29 |
| 24°F | Nov 4 | Nov 9 | Nov 14 | Nov 17 | Nov 21 | Nov 25 | Nov 30 | Dec 3 | Dec 10 |
| 20°F | Nov 14 | Nov 20 | Nov 26 | Dec 1 | Dec 4 | Dec 9 | Dec 19 | Dec 27 | Jan 4 |
| 16°F | Nov 28 | Dec 5 | Dec 14 | Dec 22 | Dec 27 | Jan 1 | Jan 6 | Jan 12 | Jan 22 |
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: Moulton 2, Al, about 11.4 miles away@if(!empty($station['elevation_ft'])), at 622 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 Trinity, AL?
On average, the last spring frost (32°F) around Trinity, AL is about Apr 2. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 17.
When is the first frost in the fall?
The first fall frost around Trinity, AL typically arrives about Oct 31. 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 Apr 2 on average, or Mar 17 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 209 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 35673 Planting calendar → Alabama frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026