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 40211
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 40211 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Louisville McAlpine, KY, is 3 miles from the ZIP's center: its last spring frost comes after March 31 in half of years and after April 14 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Louisville McAlpine, KY | 3 mi | 440 ft | March 31 | April 14 | November 9 | – |
| Louisville, KYLouisville International Airport | 6 mi | 488 ft | March 31 | April 16 | November 7 | 7a |
| Louisville Bowman Field, KY | 9 mi | 540 ft | April 3 | April 19 | November 3 | 7b |
| Louisville Weather Office, KY | 13 mi | 632 ft | April 6 | April 23 | November 1 | – |
| Crestwood, KY4 mi NE | 24 mi | 780 ft | April 12 | May 1 | October 25 | – |
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 Louisville McAlpine
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 30 | April 18 | April 11 | March 26 | November 1 | October 21 |
| 32°F | April 14 | April 5 | March 31 | March 14 | November 9 | October 31 |
| 28°F (hard freeze) | April 2 | March 26 | March 18 | February 28 | November 20 | November 5 |
| 24°F | March 26 | March 15 | March 8 | February 14 | December 1 | November 14 |
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.