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 58105
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 58105 in zone 4a (the coldest night of a typical year: -30 to -25°F).
The nearest station, Fargo, ND, is 2 miles from the ZIP's center: its last spring frost comes after May 10 in half of years and after May 23 in one year in ten. By the USDA's method its plant hardiness zone is 4a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Fargo, NDFargo Hector International Airport | 2 mi | 900 ft | May 10 | May 23 | September 30 | 4a |
| Moorhead, MN | 3 mi | 904 ft | May 5 | May 20 | October 3 | 4b |
| Fargo (3 mi S), ND | 5 mi | 908 ft | May 4 | May 18 | October 2 | – |
| Georgetown, MN1 mi E | 13 mi | 885 ft | May 9 | May 23 | October 1 | 4a |
| Casselton, NDCasselton Agronomy Farm | 20 mi | 935 ft | May 9 | May 21 | October 1 | 4a |
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 Fargo
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 2 | May 25 | May 19 | May 6 | September 22 | September 9 |
| 32°F | May 23 | May 15 | May 10 | April 27 | September 30 | September 18 |
| 28°F (hard freeze) | May 15 | May 6 | April 30 | April 15 | October 10 | September 26 |
| 24°F | May 5 | April 27 | April 20 | April 5 | October 21 | October 4 |
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.