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 84401
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 84401 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Ogden Sugar Factory, UT, is 1 miles from the ZIP's center: its last spring frost comes after April 22 in half of years and after May 9 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Ogden Sugar Factory, UT | 1 mi | 4,280 ft | April 22 | May 9 | October 18 | – |
| Ogden, UTOgden Hinkley Airport | 2 mi | 4,470 ft | April 22 | May 10 | October 22 | 7a |
| Ogden Pioneer Powerhouse, UT | 5 mi | 4,350 ft | April 21 | May 6 | October 23 | – |
| Ogden NE Bench, UT | 5 mi | 4,572 ft | April 19 | May 4 | October 22 | – |
| Weber Basin Pump Plant 3, UT | 10 mi | 4,900 ft | April 29 | May 25 | October 20 | – |
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 Ogden Sugar Factory
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 26 | May 15 | May 7 | April 22 | October 6 | September 23 |
| 32°F | May 9 | April 30 | April 22 | April 5 | October 18 | October 1 |
| 28°F (hard freeze) | April 22 | April 10 | April 3 | March 12 | October 29 | October 15 |
| 24°F | April 4 | March 23 | March 13 | February 27 | November 9 | October 23 |
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.