Frost dates by ZIP code: The nearest NOAA stations to your ZIP, 1991-2020 normals
Enter a five-digit ZIP code. PlainClimate finds its center (Census Bureau 2024) and the five nearest NOAA stations with frost dates, and shows each station's last spring and first autumn 32°F dates with its distance and elevation.
Frost dates near ZIP 70458
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 70458 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Slidell station, LA, is 1 miles from the ZIP's center: its last spring frost comes after February 24 in half of years and after March 19 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Slidell station, LA | 1 mi | 10 ft | February 24 | March 19 | December 1 | – |
| Slidell, LASlidell Airport | 6 mi | 27 ft | March 3 | March 26 | November 21 | 9a |
| Bay St. Louis, MSBay St Louis Nasa | 14 mi | 30 ft | March 6 | March 27 | November 19 | – |
| Picayune, MS | 20 mi | 64 ft | March 9 | March 31 | November 18 | – |
| New Orleans Lakefront Airport, LA | 20 mi | 9 ft | January 22 | February 23 | January 5 | 9b |
Frost comes later in spring at higher and colder stations and earlier in low, open ground: prefer a station at a similar elevation to yours. Hardiness zone in the table: the USDA's rule (the average of each year's coldest night, 1991-2020) applied to the station's own record.
Every frost threshold at Slidell station
NOAA publishes the dates for several temperatures and odds. A 30% spring date means a 3-in-10 chance of a later frost (the convention almanacs use); 50% is the median; 10% the cautious date.
| Threshold | Spring, 10% | Spring, 30% | Spring, 50% | Spring, 90% | Autumn, 50% | Autumn, 10% |
|---|---|---|---|---|---|---|
| 36°F (light frost) | April 2 | March 22 | March 12 | February 18 | November 16 | November 1 |
| 32°F | March 19 | March 5 | February 24 | January 29 | December 1 | November 9 |
| 28°F (hard freeze) | March 6 | February 18 | February 4 | January 4 | December 26 | November 26 |
| 24°F | February 23 | February 2 | January 22 | December 26 | January 5 | December 8 |
Source: NOAA NCEI 1991-2020 annual normals; ZIP centers: Census Bureau 2024 Gazetteer; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. Autumn 10%: one year in ten has its first frost before this date.