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 70043
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 70043 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Chalmette, LA, is 1 miles from the ZIP's center: its last spring frost comes after February 10 in half of years and after March 8 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Chalmette, LA | 1 mi | 3 ft | February 10 | March 8 | December 17 | – |
| Terrytown, LA3 mi S | 5 mi | 10 ft | February 1 | March 6 | December 31 | 9b |
| New Orleans Lakefront Airport, LA | 8 mi | 9 ft | January 22 | February 23 | January 5 | 9b |
| St Bernard, LA | 10 mi | 5 ft | February 4 | March 6 | December 15 | – |
| New Orleans Alvin Callender Fl, LA | 10 mi | 5 ft | February 18 | March 13 | December 6 | – |
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 Chalmette
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) | March 17 | March 6 | February 26 | January 30 | November 29 | November 10 |
| 32°F | March 8 | February 23 | February 10 | January 12 | December 17 | November 21 |
| 28°F (hard freeze) | February 21 | February 4 | January 26 | December 31 | January 2 | December 4 |
| 24°F | February 11 | January 30 | January 18 | December 28 | January 9 | December 20 |
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.