Last spring frost
Mar 19
Frost Dates for Harrisonburg, LA
First fall frost
Nov 12
Growing season
238 days
Hardiness zone
8b
In an average year around Harrisonburg, LA, the last spring frost (32°F) is about Mar 19 and the first fall frost is about Nov 12, giving roughly a 238-day growing season. To be safe most years, wait until Feb 25 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 21 | Apr 2 | Mar 12 |
| Freeze (32°F) | Apr 9 | Mar 19 | Feb 25 |
| Hard (28°F) | Mar 29 | Mar 1 | Jan 31 |
| Severe (24°F) | Mar 11 | Feb 9 | Jan 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 21 | Apr 15 | Apr 10 | Apr 6 | Apr 2 | Mar 30 | Mar 25 | Mar 19 | Mar 12 |
| 32°F | Apr 9 | Apr 4 | Mar 30 | Mar 25 | Mar 19 | Mar 14 | Mar 8 | Mar 2 | Feb 25 |
| 28°F | Mar 29 | Mar 19 | Mar 12 | Mar 6 | Mar 1 | Feb 25 | Feb 19 | Feb 11 | Jan 31 |
| 24°F | Mar 11 | Mar 4 | Feb 25 | Feb 17 | Feb 9 | Feb 1 | Jan 28 | Jan 19 | Jan 7 |
| 20°F | Mar 1 | Feb 17 | Feb 4 | Jan 30 | Jan 25 | Jan 18 | Jan 12 | Jan 5 | Dec 28 |
| 16°F | Feb 12 | Feb 2 | Jan 30 | Jan 25 | Jan 18 | Jan 12 | Jan 8 | Jan 3 | Dec 28 |
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 | Nov 1 | Nov 16 |
| Freeze (32°F) | Oct 29 | Nov 12 | Dec 2 |
| Hard (28°F) | Nov 6 | Nov 25 | Dec 23 |
| Severe (24°F) | Nov 18 | Dec 14 | Jan 15 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 18 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 4 | Nov 6 | Nov 11 | Nov 16 |
| 32°F | Oct 29 | Nov 2 | Nov 5 | Nov 8 | Nov 12 | Nov 15 | Nov 20 | Nov 25 | Dec 2 |
| 28°F | Nov 6 | Nov 12 | Nov 17 | Nov 21 | Nov 25 | Nov 30 | Dec 4 | Dec 9 | Dec 23 |
| 24°F | Nov 18 | Nov 26 | Dec 1 | Dec 7 | Dec 14 | Dec 23 | Dec 31 | Jan 5 | Jan 15 |
| 20°F | Dec 6 | Dec 19 | Dec 26 | Jan 1 | Jan 4 | Jan 8 | Jan 14 | Jan 21 | Feb 3 |
| 16°F | Dec 25 | Jan 1 | Jan 2 | Jan 5 | Jan 9 | Jan 13 | Jan 19 | Jan 27 | 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: Jena, La, about 13.5 miles away@if(!empty($station['elevation_ft'])), at 143 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 Harrisonburg, LA?
On average, the last spring frost (32°F) around Harrisonburg, LA is about Mar 19. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 25.
When is the first frost in the fall?
The first fall frost around Harrisonburg, LA typically arrives about Nov 12. 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 19 on average, or Feb 25 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 238 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 71401 Planting calendar → Louisiana frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026