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 83712
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 83712 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Boise Lucky Peak Dam, ID, is 7 miles from the ZIP's center: its last spring frost comes after April 30 in half of years and after May 18 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Boise Lucky Peak Dam, ID | 7 mi | 2,840 ft | April 30 | May 18 | October 22 | – |
| Boise, IDBoise Air Terminal | 8 mi | 2,814 ft | April 24 | May 9 | October 21 | 7b |
| Arrowrock Dam, ID | 9 mi | 3,235 ft | April 28 | May 16 | October 14 | – |
| Boise (7 mi N), ID | 10 mi | 3,885 ft | May 17 | June 10 | October 12 | 7a |
| Idaho City, ID | 20 mi | 3,965 ft | June 17 | July 4 | September 5 | – |
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 Boise Lucky Peak Dam
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) | June 8 | May 25 | May 16 | April 27 | October 8 | September 16 |
| 32°F | May 18 | May 7 | April 30 | April 11 | October 22 | September 30 |
| 28°F (hard freeze) | May 3 | April 20 | April 9 | March 17 | November 1 | October 13 |
| 24°F | April 6 | March 26 | March 17 | February 28 | November 12 | October 27 |
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.