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 84770
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 84770 in zone 8b (the coldest night of a typical year: 15 to 20°F).
The nearest station, St. George, UT, is 2 miles from the ZIP's center: its last spring frost comes after March 14 in half of years and after April 6 in one year in ten. By the USDA's method its plant hardiness zone is 8b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| St. George, UTSt George | 2 mi | 2,857 ft | March 14 | April 6 | November 10 | 8b |
| Veyo, UTVeyo Powerhouse | 15 mi | 4,600 ft | April 9 | April 28 | November 5 | 8a |
| La Verkin, UT | 20 mi | 3,194 ft | April 1 | April 24 | November 5 | 8a |
| Lytle Ranch, UT | 22 mi | 2,787 ft | March 18 | April 16 | November 9 | – |
| Beaver Dam, AZ | 23 mi | 1,931 ft | March 7 | April 10 | November 19 | 8b |
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 St. George
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 21 | April 11 | April 3 | March 17 | November 1 | October 19 |
| 32°F | April 6 | March 25 | March 14 | February 27 | November 10 | October 27 |
| 28°F (hard freeze) | March 17 | March 5 | February 27 | February 7 | November 20 | November 7 |
| 24°F | February 28 | February 18 | February 9 | January 18 | December 1 | November 18 |
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.