Last spring frost
Mar 25
Frost Dates for Union Springs, AL
First fall frost
Nov 6
Growing season
226 days
Hardiness zone
8b
In an average year around Union Springs, AL, the last spring frost (32°F) is about Mar 25 and the first fall frost is about Nov 6, giving roughly a 226-day growing season. To be safe most years, wait until Feb 28 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 24 | Apr 7 | Mar 18 |
| Freeze (32°F) | Apr 13 | Mar 25 | Feb 28 |
| Hard (28°F) | Mar 30 | Mar 9 | Feb 9 |
| Severe (24°F) | Mar 16 | Feb 19 | Jan 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 24 | Apr 19 | Apr 14 | Apr 11 | Apr 7 | Apr 4 | Mar 31 | Mar 26 | Mar 18 |
| 32°F | Apr 13 | Apr 6 | Apr 1 | Mar 29 | Mar 25 | Mar 21 | Mar 17 | Mar 10 | Feb 28 |
| 28°F | Mar 30 | Mar 24 | Mar 18 | Mar 14 | Mar 9 | Mar 4 | Feb 28 | Feb 20 | Feb 9 |
| 24°F | Mar 16 | Mar 8 | Mar 2 | Feb 26 | Feb 19 | Feb 12 | Feb 5 | Jan 30 | Jan 19 |
| 20°F | Mar 3 | Feb 25 | Feb 14 | Feb 6 | Feb 1 | Jan 29 | Jan 22 | Jan 12 | Dec 31 |
| 16°F | Feb 21 | Feb 7 | Feb 2 | Jan 30 | Jan 24 | Jan 17 | Jan 11 | Jan 4 | Dec 26 |
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 15 | Oct 29 | Nov 11 |
| Freeze (32°F) | Oct 24 | Nov 6 | Nov 25 |
| Hard (28°F) | Nov 1 | Nov 17 | Dec 11 |
| Severe (24°F) | Nov 10 | Dec 2 | Jan 9 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 15 | Oct 20 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 11 |
| 32°F | Oct 24 | Oct 29 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 17 | Nov 25 |
| 28°F | Nov 1 | Nov 5 | Nov 9 | Nov 12 | Nov 17 | Nov 21 | Nov 27 | Dec 2 | Dec 11 |
| 24°F | Nov 10 | Nov 17 | Nov 22 | Nov 27 | Dec 2 | Dec 8 | Dec 20 | Jan 1 | Jan 9 |
| 20°F | Nov 23 | Dec 2 | Dec 11 | Dec 22 | Dec 30 | Jan 3 | Jan 10 | Jan 19 | Feb 1 |
| 16°F | Dec 11 | Dec 24 | Jan 1 | Jan 4 | Jan 9 | Jan 15 | Jan 21 | Jan 30 | Feb 6 |
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: Union Springs 9 S, Al, about 10.2 miles away@if(!empty($station['elevation_ft'])), at 440 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 Union Springs, AL?
On average, the last spring frost (32°F) around Union Springs, AL is about Mar 25. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 28.
When is the first frost in the fall?
The first fall frost around Union Springs, AL typically arrives about Nov 6. 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 25 on average, or Feb 28 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 226 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 36089 Planting calendar → Alabama frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026