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 33559
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 33559 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, St. Leo, FL, is 15 miles from the ZIP's center: its last spring frost comes after January 31 in half of years and after February 28 in one year in ten. By the USDA's method its plant hardiness zone is 9b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| St. Leo, FLSaint Leo | 15 mi | 190 ft | January 31 | February 28 | January 8 | 9b |
| Tampa, FLTampa International Airport | 16 mi | 19 ft | January 20 | February 10 | January 12 | 10a |
| Plant City, FL | 19 mi | 110 ft | January 30 | March 2 | January 6 | 9b |
| Tarpon Springs, FLTarpon Springs Sewage Plant | 21 mi | 6 ft | January 20 | February 14 | January 9 | 10a |
| Brooksville, FLBrooksville Hernando County Airport | 22 mi | 77 ft | March 1 | March 27 | December 5 | 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 St. Leo
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 15 | February 28 | February 16 | January 16 | December 22 | November 28 |
| 32°F | February 28 | February 12 | January 31 | January 3 | January 8 | December 10 |
| 28°F (hard freeze) | February 19 | February 3 | January 24 | December 27 | January 14 | December 21 |
| 24°F | February 7 | February 1 | January 22 | December 29 | January 21 | December 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.