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 84041
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 84041 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Farmington, UT, is 4 miles from the ZIP's center: its last spring frost comes after April 19 in half of years and after May 7 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Farmington, UT3 mi NW | 4 mi | 4,380 ft | April 19 | May 7 | October 19 | – |
| Weber Basin Pump Plant 3, UT | 4 mi | 4,900 ft | April 29 | May 25 | October 20 | – |
| Ogden, UTOgden Hinkley Airport | 9 mi | 4,470 ft | April 22 | May 10 | October 22 | 7a |
| Ogden Sugar Factory, UT | 11 mi | 4,280 ft | April 22 | May 9 | October 18 | – |
| Ogden Pioneer Powerhouse, UT | 12 mi | 4,350 ft | April 21 | May 6 | October 23 | – |
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 Farmington
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 24 | May 12 | May 3 | April 19 | October 9 | September 28 |
| 32°F | May 7 | April 27 | April 19 | April 1 | October 19 | October 6 |
| 28°F (hard freeze) | April 19 | April 9 | April 1 | March 12 | November 1 | October 15 |
| 24°F | April 3 | March 24 | March 14 | February 23 | November 13 | October 26 |
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.