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 85140
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 85140 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Chandler, AZ, is 12 miles from the ZIP's center: its last spring frost comes after February 1 in half of years and after February 27 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Chandler, AZChandler Heights | 12 mi | 1,425 ft | February 1 | February 27 | December 11 | – |
| Apache Junction, AZ5 mi NE | 15 mi | 2,070 ft | February 11 | March 7 | December 10 | 9b |
| Mesa, AZEast Mesa | 15 mi | 1,518 ft | February 1 | February 28 | December 10 | 9b |
| Florence, AZ | 16 mi | 1,400 ft | January 30 | February 24 | December 12 | – |
| Coolidge, AZCasa Grande National Monument | 18 mi | 1,419 ft | February 17 | March 8 | November 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 Chandler
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 11 | March 2 | February 21 | January 29 | November 28 | November 12 |
| 32°F | February 27 | February 12 | February 1 | January 2 | December 11 | November 23 |
| 28°F (hard freeze) | February 11 | January 24 | January 8 | December 15 | December 26 | December 4 |
| 24°F | January 29 | January 9 | January 2 | December 13 | January 1 | December 13 |
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.