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 33311
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 33311 in zone 11a (the coldest night of a typical year: 40 to 45°F).
The nearest station, Loxahatchee National Wildlife Refuge, FL, is 25 miles from the ZIP's center: a night at 32°F or colder comes there in only 11% of years, and NOAA's median date of the last spring frost is January 22. By the USDA's method its plant hardiness zone is 10b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Loxahatchee National Wildlife Refuge, FL | 25 mi | 21 ft | January 22 | February 7 | January 17 | 10b |
| South Bay (15 mi S), FL | 37 mi | 20 ft | January 18 | February 2 | January 14 | 10a |
| Perrine (4 mi W), FL | 42 mi | 10 ft | January 18 | February 1 | January 13 | 10b |
| Palm Beach Gardens, FL | 47 mi | 20 ft | January 21 | February 12 | January 15 | 10b |
| Belle Glade, FL | 49 mi | 20 ft | January 27 | February 18 | January 16 | – |
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 Loxahatchee National Wildlife Refuge
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 22 | February 3 | January 26 | January 3 | January 16 | December 28 |
| 32°F | February 7 | January 31 | January 22 | December 31 | January 17 | December 31 |
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.