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 42223
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 42223 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Clarksville, TN, is 3 miles from the ZIP's center: its last spring frost comes after April 6 in half of years and after April 23 in one year in ten. By the USDA's method its plant hardiness zone is 7b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Clarksville, TNClarksville Outlaw Airport | 3 mi | 560 ft | April 6 | April 23 | October 28 | 7b |
| Clarksville Wastewater Treatment Plant, TN | 10 mi | 402 ft | April 3 | April 20 | November 1 | 7b |
| Clarksville No.2, TN | 12 mi | 496 ft | April 10 | April 26 | October 30 | – |
| Hopkinsville, KY | 15 mi | 520 ft | April 4 | April 19 | November 2 | – |
| Elkton, KY | 21 mi | 619 ft | April 3 | April 21 | October 29 | – |
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 Clarksville
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 4 | April 24 | April 18 | April 3 | October 19 | October 7 |
| 32°F | April 23 | April 13 | April 6 | March 20 | October 28 | October 15 |
| 28°F (hard freeze) | April 11 | April 1 | March 25 | March 7 | November 7 | October 26 |
| 24°F | March 31 | March 20 | March 13 | February 21 | November 18 | 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.