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 33511
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 33511 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Plant City, FL, is 12 miles from the ZIP's center: its last spring frost comes after January 30 in half of years and after March 2 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 |
|---|---|---|---|---|---|---|
| Plant City, FL | 12 mi | 110 ft | January 30 | March 2 | January 6 | 9b |
| Tampa, FLTampa International Airport | 15 mi | 19 ft | January 20 | February 10 | January 12 | 10a |
| Ruskin, FLTampa Bay Area Weather Office | 16 mi | 40 ft | January 20 | February 16 | January 9 | 10a |
| Lakeland, FLLakeland 2 | 18 mi | 139 ft | January 26 | February 21 | January 9 | 9b |
| Parrish, FL | 21 mi | 60 ft | January 28 | February 24 | January 9 | 10a |
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 Plant City
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 | February 28 | February 16 | January 17 | December 25 | November 27 |
| 32°F | March 2 | February 9 | January 30 | December 31 | January 6 | December 8 |
| 28°F (hard freeze) | February 10 | January 29 | January 20 | December 29 | January 11 | December 19 |
| 24°F | January 29 | January 17 | January 9 | December 20 | January 8 | 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.