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 86314
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 86314 in zone 7b (the coldest night of a typical year: 5 to 10°F).
The nearest station, Prescott station, AZ, is 6 miles from the ZIP's center: its last spring frost comes after April 30 in half of years and after May 15 in one year in ten. By the USDA's method its plant hardiness zone is 7b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Prescott station, AZ | 6 mi | 5,205 ft | April 30 | May 15 | October 20 | 7b |
| Prescott, AZPrescott Love Field | 6 mi | 5,042 ft | April 20 | May 7 | October 27 | 8a |
| Chino Valley, AZ | 13 mi | 4,750 ft | April 27 | May 18 | October 24 | – |
| Jerome, AZ | 16 mi | 4,950 ft | March 26 | April 19 | November 25 | 9a |
| Cottonwood, AZTuzigoot | 21 mi | 3,470 ft | March 30 | April 21 | November 10 | 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 Prescott station
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 30 | May 18 | May 12 | April 28 | October 10 | September 29 |
| 32°F | May 15 | May 6 | April 30 | April 14 | October 20 | October 7 |
| 28°F (hard freeze) | May 2 | April 21 | April 13 | March 28 | October 31 | October 16 |
| 24°F | April 16 | April 3 | March 26 | March 5 | November 12 | October 24 |
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.