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 40507
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 40507 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Lexington, KY, is 6 miles from the ZIP's center: its last spring frost comes after April 13 in half of years and after May 1 in one year in ten. By the USDA's method its plant hardiness zone is 7a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Lexington, KYLexington Bluegrass Airport | 6 mi | 980 ft | April 13 | May 1 | October 28 | 7a |
| Versailles, KY3 mi NNW | 14 mi | 891 ft | April 12 | May 2 | October 28 | 7a |
| Dix Dam, KY | 21 mi | 870 ft | April 7 | April 24 | November 1 | 7a |
| Richmond, KYEastern Kentucky University | 22 mi | 1,000 ft | April 15 | April 30 | October 22 | – |
| Frankfort, KYFrankfort Capital City Airport | 24 mi | 804 ft | April 15 | May 5 | October 24 | 7a |
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 Lexington
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) | May 11 | May 1 | April 24 | April 10 | October 19 | October 6 |
| 32°F | May 1 | April 20 | April 13 | March 30 | October 28 | October 16 |
| 28°F (hard freeze) | April 16 | April 5 | March 31 | March 15 | November 6 | October 25 |
| 24°F | April 4 | March 26 | March 20 | February 28 | November 17 | November 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.