Last spring frost
Mar 18
Frost Dates for Troy, AL
First fall frost
Nov 10
Growing season
236 days
Hardiness zone
8b
In an average year around Troy, AL, the last spring frost (32°F) is about Mar 18 and the first fall frost is about Nov 10, giving roughly a 236-day growing season. To be safe most years, wait until Feb 24 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 2 | Mar 15 |
| Freeze (32°F) | Apr 7 | Mar 18 | Feb 24 |
| Hard (28°F) | Mar 23 | Mar 2 | Feb 3 |
| Severe (24°F) | Mar 11 | Feb 12 | Jan 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 14 | Apr 9 | Apr 6 | Apr 2 | Mar 30 | Mar 26 | Mar 22 | Mar 15 |
| 32°F | Apr 7 | Apr 1 | Mar 27 | Mar 23 | Mar 18 | Mar 14 | Mar 9 | Mar 3 | Feb 24 |
| 28°F | Mar 23 | Mar 16 | Mar 12 | Mar 7 | Mar 2 | Feb 27 | Feb 23 | Feb 15 | Feb 3 |
| 24°F | Mar 11 | Mar 2 | Feb 26 | Feb 19 | Feb 12 | Feb 6 | Jan 31 | Jan 26 | Jan 13 |
| 20°F | Feb 27 | Feb 15 | Feb 8 | Feb 2 | Jan 30 | Jan 24 | Jan 16 | Jan 9 | Dec 29 |
| 16°F | Feb 12 | Feb 4 | Feb 1 | Jan 29 | Jan 24 | Jan 18 | Jan 11 | Jan 5 | Dec 27 |
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 18 | Oct 31 | Nov 13 |
| Freeze (32°F) | Oct 28 | Nov 10 | Nov 29 |
| Hard (28°F) | Nov 5 | Nov 21 | Dec 20 |
| Severe (24°F) | Nov 16 | Dec 9 | Jan 15 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 18 | Oct 22 | Oct 25 | Oct 28 | Oct 31 | Nov 1 | Nov 5 | Nov 8 | Nov 13 |
| 32°F | Oct 28 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 13 | Nov 16 | Nov 20 | Nov 29 |
| 28°F | Nov 5 | Nov 10 | Nov 14 | Nov 17 | Nov 21 | Nov 26 | Dec 1 | Dec 5 | Dec 20 |
| 24°F | Nov 16 | Nov 23 | Nov 29 | Dec 4 | Dec 9 | Dec 19 | Dec 28 | Jan 4 | Jan 15 |
| 20°F | Nov 30 | Dec 7 | Dec 17 | Dec 28 | Jan 1 | Jan 5 | Jan 12 | Jan 20 | Feb 1 |
| 16°F | Dec 15 | Dec 30 | Jan 3 | Jan 6 | Jan 11 | Jan 17 | Jan 23 | Jan 29 | Feb 3 |
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: Troy Muni Ap, Al, about 7.5 miles away@if(!empty($station['elevation_ft'])), at 397 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 Troy, AL?
On average, the last spring frost (32°F) around Troy, AL is about Mar 18. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 24.
When is the first frost in the fall?
The first fall frost around Troy, AL typically arrives about Nov 10. 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 18 on average, or Feb 24 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 36081 Planting calendar → Alabama frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026