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 38305
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 38305 in zone 7b (the coldest night of a typical year: 5 to 10°F).
The nearest station, Jackson (4 mi NE), TN, is 3 miles from the ZIP's center: its last spring frost comes after April 4 in half of years and after April 21 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Jackson (4 mi NE), TN | 3 mi | 430 ft | April 4 | April 21 | October 30 | – |
| Jackson Experiment Station, TN | 7 mi | 400 ft | April 2 | April 18 | October 29 | 7b |
| Jackson, TNJackson McKellar Airport | 11 mi | 433 ft | April 5 | April 21 | October 29 | 7b |
| Milan, TNMilan Experiment Station | 16 mi | 415 ft | April 4 | April 21 | October 28 | 7b |
| Henderson, TN4 mi W | 18 mi | 460 ft | April 10 | April 26 | 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 Jackson (4 mi NE)
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 1 | April 23 | April 16 | March 31 | October 22 | October 10 |
| 32°F | April 21 | April 11 | April 4 | March 18 | October 30 | October 18 |
| 28°F (hard freeze) | April 11 | April 2 | March 24 | March 4 | November 8 | October 27 |
| 24°F | April 2 | March 19 | March 11 | February 19 | November 21 | November 5 |
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.