Frost dates for Slidell, LA
At Slidell, the median last spring frost (32°F) is Feb 24 and the median first fall frost is Dec 1, for a typical growing season of 281 days. For a 90% chance that the last frost has passed, wait until Mar 19. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Feb 24Last spring frost (median)50% chance of 32°F after this date
- Mar 19Safer planting date10% chance of 32°F after this date
- Dec 1First fall frost (median)50% chance of 32°F by this date
- 281 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Feb 18 | Mar 12 | Apr 2 |
| 32°F | Jan 29 | Feb 24 | Mar 19 |
| 28°F | Jan 4 | Feb 4 | Mar 6 |
| 24°F | Dec 26 | Jan 22 | Feb 23 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Nov 1 | Nov 16 | Dec 7 |
| 32°F | Nov 9 | Dec 1 | Jan 3 |
| 28°F | Nov 26 | Dec 26 | Jan 26 |
| 24°F | Dec 8 | Jan 5 | Feb 4 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 222 days | 250 days | 279 days |
| 32°F | 251 days | 281 days | 319 days |
| 28°F | 282 days | 321 days | 361 days |
| 24°F | 314 days | 351 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 94% |
| 24°F | 64% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 70458 | 9a | 20 to 25°F | 2 km |
| 70461 | 9a | 20 to 25°F | 7 km |
| 70129 | 9b | 25 to 30°F | 21 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00168539, at 30.2650, -89.7697, elevation 3 m (10 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 16.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Slidell Airport (10 km)
- New Orleans Lakefront Airport (35 km)
- Chalmette (41 km)
- Covington 4 NNW (44 km)
- St. Bernard (44 km)
- Terrytown 3s (47 km)
- New Orleans Audubon (52 km)
- New Orleans Alvin Callender Fl (55 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.