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 85194
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 85194 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Casa Grande, AZ, is 5 miles from the ZIP's center: its last spring frost comes after February 5 in half of years and after February 28 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Casa Grande, AZ | 5 mi | 1,400 ft | February 5 | February 28 | December 6 | – |
| Robson Ranch, AZ | 6 mi | 1,495 ft | February 7 | March 4 | December 3 | – |
| Coolidge, AZCasa Grande National Monument | 8 mi | 1,419 ft | February 17 | March 8 | November 29 | – |
| Eloy, AZ4 mi NE | 10 mi | 1,545 ft | February 24 | March 18 | November 28 | – |
| Arizona City, AZ | 12 mi | 1,525 ft | February 28 | March 14 | November 21 | – |
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 Casa Grande
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) | March 16 | March 4 | February 26 | January 31 | November 24 | November 7 |
| 32°F | February 28 | February 17 | February 5 | January 5 | December 6 | November 18 |
| 28°F (hard freeze) | February 15 | January 31 | January 14 | December 16 | December 22 | November 29 |
| 24°F | February 5 | January 16 | January 6 | December 10 | January 1 | December 9 |
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.