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 39503
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 39503 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Gulfport, MS, is 6 miles from the ZIP's center: its last spring frost comes after February 23 in half of years and after March 16 in one year in ten. By the USDA's method its plant hardiness zone is 9a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Gulfport, MSGulfport - Biloxi Airport | 6 mi | 42 ft | February 23 | March 16 | December 3 | 9a |
| Gulfport Naval Center, MS | 7 mi | 35 ft | February 18 | March 14 | December 14 | 9a |
| Biloxi, MS | 10 mi | 10 ft | February 12 | March 11 | December 14 | 9a |
| Saucier, MSSaucier Experiment Forest | 12 mi | 229 ft | March 7 | March 27 | November 22 | 9a |
| Waveland, MS | 19 mi | 8 ft | February 21 | March 18 | December 3 | 9a |
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 Gulfport
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 30 | March 18 | March 9 | February 16 | November 18 | November 3 |
| 32°F | March 16 | March 5 | February 23 | January 25 | December 3 | November 12 |
| 28°F (hard freeze) | March 5 | February 15 | February 1 | January 5 | December 31 | November 28 |
| 24°F | February 24 | February 1 | January 24 | December 29 | January 7 | December 12 |
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.