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 85613
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 85613 in zone 8b (the coldest night of a typical year: 15 to 20°F).
The nearest station, Fort Huachuca Pioneer Airfield, AZ, is 5 miles from the ZIP's center: its last spring frost comes after March 16 in half of years and after April 12 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Fort Huachuca Pioneer Airfield, AZ | 5 mi | 4,768 ft | March 16 | April 12 | November 21 | – |
| Elgin, AZ5 mi S | 7 mi | 4,811 ft | April 18 | May 3 | November 1 | 8a |
| Canelo (1 mi NW), AZ | 7 mi | 5,010 ft | April 23 | May 7 | October 30 | – |
| Sierra Vista, AZ | 8 mi | 4,606 ft | April 5 | April 21 | November 9 | – |
| Coronado National Memorial, AZ | 16 mi | 5,242 ft | April 7 | April 27 | November 9 | 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 Fort Huachuca Pioneer Airfield
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 26 | April 17 | April 9 | March 20 | November 8 | October 24 |
| 32°F | April 12 | March 31 | March 16 | February 19 | November 21 | November 3 |
| 28°F (hard freeze) | March 23 | March 3 | February 20 | January 16 | December 6 | November 18 |
| 24°F | February 23 | February 8 | January 26 | December 23 | December 22 | December 1 |
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.