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 33409
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 33409 in zone 10b (the coldest night of a typical year: 35 to 40°F).
The nearest station, Palm Beach Gardens, FL, is 8 miles from the ZIP's center: a night at 32°F or colder comes there in only 18% of years, and NOAA's median date of the last spring frost is January 21. 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 |
|---|---|---|---|---|---|---|
| Palm Beach Gardens, FL | 8 mi | 20 ft | January 21 | February 12 | January 15 | 10b |
| Juno Beach, FL | 10 mi | 5 ft | January 26 | February 15 | January 16 | 10b |
| Loxahatchee National Wildlife Refuge, FL | 17 mi | 21 ft | January 22 | February 7 | January 17 | 10b |
| Port Salerno, FL5 mi W | 28 mi | 12 ft | January 26 | February 18 | January 15 | – |
| Stuart, FL | 34 mi | 13 ft | January 23 | February 10 | January 18 | – |
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 Palm Beach Gardens
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 7 | January 31 | January 1 | January 17 | December 25 |
| 32°F | February 12 | February 2 | January 21 | December 29 | January 15 | December 25 |
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.