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 39401
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 39401 in zone 8b (the coldest night of a typical year: 15 to 20°F).
The nearest station, Hattiesburg, MS, is 3 miles from the ZIP's center: its last spring frost comes after March 8 in half of years and after March 28 in one year in ten. By the USDA's method its plant hardiness zone is 8b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Hattiesburg, MSHattiesburg Chain Municipal Airport | 3 mi | 151 ft | March 8 | March 28 | November 15 | 8b |
| Hattiesburg (5 mi SW), MS | 5 mi | 385 ft | March 7 | March 26 | November 23 | – |
| Beaumont, MSBeaumont Expstation | 21 mi | 194 ft | March 18 | April 6 | November 12 | 8b |
| Wiggins, MS | 26 mi | 160 ft | March 14 | April 2 | November 18 | – |
| Laurel, MS | 32 mi | 225 ft | March 12 | April 1 | November 12 | 8b |
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 Hattiesburg
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 13 | April 2 | March 24 | March 3 | November 4 | October 23 |
| 32°F | March 28 | March 16 | March 8 | February 16 | November 15 | November 1 |
| 28°F (hard freeze) | March 15 | March 2 | February 22 | January 26 | November 30 | November 10 |
| 24°F | March 3 | February 14 | February 2 | January 2 | December 28 | November 26 |
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.