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 79121
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 79121 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Bushland, TX, is 9 miles from the ZIP's center: its last spring frost comes after April 22 in half of years and after May 3 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 |
|---|---|---|---|---|---|---|
| Bushland, TX1 mi WSW | 9 mi | 3,819 ft | April 22 | May 3 | October 21 | 7a |
| Amarillo (7 mi ENE), TX | 13 mi | 3,590 ft | April 15 | April 29 | October 29 | – |
| Amarillo, TXAmarillo Airport | 13 mi | 3,587 ft | April 13 | April 29 | October 27 | 7a |
| Canyon, TX | 13 mi | 3,590 ft | April 15 | May 1 | October 25 | 7a |
| Boys Ranch, TX | 31 mi | 3,191 ft | April 19 | May 2 | October 23 | 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 Bushland
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 6 | May 2 | April 20 | October 13 | September 29 |
| 32°F | May 3 | April 27 | April 22 | April 10 | October 21 | October 6 |
| 28°F (hard freeze) | April 26 | April 18 | April 12 | March 25 | October 31 | October 19 |
| 24°F | April 17 | April 5 | March 31 | March 11 | November 8 | October 27 |
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.