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 34609
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 34609 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Brooksville, FL, is 3 miles from the ZIP's center: its last spring frost comes after March 1 in half of years and after March 27 in one year in ten. By the USDA's method its plant hardiness zone is 9a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Brooksville, FLBrooksville Hernando County Airport | 3 mi | 77 ft | March 1 | March 27 | December 5 | 9a |
| Spring Hill, FLWeeki Wachee | 5 mi | 20 ft | February 5 | March 5 | January 1 | – |
| Brooksville Chinsegut Hill, FL | 13 mi | 240 ft | February 3 | March 3 | January 3 | 9b |
| St. Leo, FLSaint Leo | 18 mi | 190 ft | January 31 | February 28 | January 8 | 9b |
| Inverness, FL3 mi SE | 25 mi | 58 ft | March 3 | March 29 | 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 Brooksville
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) | April 9 | March 28 | March 17 | February 18 | November 21 | November 1 |
| 32°F | March 27 | March 12 | March 1 | January 30 | December 5 | November 11 |
| 28°F (hard freeze) | March 12 | February 21 | February 7 | January 8 | December 29 | November 27 |
| 24°F | February 21 | February 3 | January 23 | December 30 | January 7 | December 4 |
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.