Last spring frost
Mar 7
Frost Dates for Mangham, LA
First fall frost
Nov 13
Growing season
252 days
Hardiness zone
8b
In an average year around Mangham, LA, the last spring frost (32°F) is about Mar 7 and the first fall frost is about Nov 13, giving roughly a 252-day growing season. To be safe most years, wait until Feb 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 8 | Mar 20 | Mar 1 |
| Freeze (32°F) | Mar 26 | Mar 7 | Feb 17 |
| Hard (28°F) | Mar 13 | Feb 23 | Jan 28 |
| Severe (24°F) | Mar 2 | Feb 1 | Jan 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 8 | Apr 2 | Mar 29 | Mar 25 | Mar 20 | Mar 17 | Mar 12 | Mar 8 | Mar 1 |
| 32°F | Mar 26 | Mar 18 | Mar 14 | Mar 11 | Mar 7 | Mar 4 | Feb 28 | Feb 24 | Feb 17 |
| 28°F | Mar 13 | Mar 7 | Mar 3 | Feb 28 | Feb 23 | Feb 17 | Feb 11 | Feb 2 | Jan 28 |
| 24°F | Mar 2 | Feb 24 | Feb 14 | Feb 7 | Feb 1 | Jan 30 | Jan 25 | Jan 19 | Jan 10 |
| 20°F | Feb 17 | Feb 2 | Jan 30 | Jan 26 | Jan 22 | Jan 17 | Jan 13 | Jan 6 | Dec 25 |
| 16°F | Feb 12 | Feb 1 | Jan 28 | Jan 22 | Jan 18 | Jan 13 | Jan 10 | Jan 6 | 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 23 | Nov 4 | Nov 21 |
| Freeze (32°F) | Nov 1 | Nov 13 | Dec 3 |
| Hard (28°F) | Nov 7 | Nov 27 | Dec 25 |
| Severe (24°F) | Nov 18 | Dec 19 | Jan 17 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 23 | Oct 28 | Oct 31 | Nov 2 | Nov 4 | Nov 7 | Nov 11 | Nov 15 | Nov 21 |
| 32°F | Nov 1 | Nov 4 | Nov 6 | Nov 10 | Nov 13 | Nov 17 | Nov 22 | Nov 27 | Dec 3 |
| 28°F | Nov 7 | Nov 13 | Nov 18 | Nov 22 | Nov 27 | Dec 1 | Dec 5 | Dec 12 | Dec 25 |
| 24°F | Nov 18 | Nov 26 | Dec 1 | Dec 9 | Dec 19 | Dec 27 | Jan 1 | Jan 8 | Jan 17 |
| 20°F | Dec 3 | Dec 15 | Dec 27 | Jan 1 | Jan 5 | Jan 10 | Jan 14 | Jan 20 | Feb 1 |
| 16°F | Dec 25 | Jan 1 | Jan 5 | Jan 7 | Jan 10 | Jan 13 | Jan 19 | Jan 26 | 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: Winnsboro 2 Se, La, about 11.6 miles away@if(!empty($station['elevation_ft'])), at 74 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 Mangham, LA?
On average, the last spring frost (32°F) around Mangham, LA is about Mar 7. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 17.
When is the first frost in the fall?
The first fall frost around Mangham, LA typically arrives about Nov 13. 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 7 on average, or Feb 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 252 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 71259 Planting calendar → Louisiana frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026