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 33637
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 33637 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Tampa, FL, is 12 miles from the ZIP's center: a night at 32°F or colder comes there in only 35% of years, and NOAA's median date of the last spring frost is January 20. By the USDA's method its plant hardiness zone is 10a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Tampa, FLTampa International Airport | 12 mi | 19 ft | January 20 | February 10 | January 12 | 10a |
| Plant City, FL | 14 mi | 110 ft | January 30 | March 2 | January 6 | 9b |
| St. Leo, FLSaint Leo | 21 mi | 190 ft | January 31 | February 28 | January 8 | 9b |
| Lakeland, FLLakeland 2 | 22 mi | 139 ft | January 26 | February 21 | January 9 | 9b |
| St. Petersburg, FLSt Petersburg International Airport | 22 mi | 11 ft | January 17 | February 6 | January 14 | 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 Tampa
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) | February 23 | February 5 | January 29 | December 31 | January 8 | December 14 |
| 32°F | February 10 | January 31 | January 20 | December 27 | January 12 | December 23 |
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.