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 58104
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 58104 in zone 4a (the coldest night of a typical year: -30 to -25°F).
The nearest station, Fargo (3 mi S), ND, is 3 miles from the ZIP's center: its last spring frost comes after May 4 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 |
|---|---|---|---|---|---|---|
| Fargo (3 mi S), ND | 3 mi | 908 ft | May 4 | May 18 | October 2 | – |
| Moorhead, MN | 8 mi | 904 ft | May 5 | May 20 | October 3 | 4b |
| Fargo, NDFargo Hector International Airport | 9 mi | 900 ft | May 10 | May 23 | September 30 | 4a |
| Casselton, NDCasselton Agronomy Farm | 20 mi | 935 ft | May 9 | May 21 | October 1 | 4a |
| Georgetown, MN1 mi E | 20 mi | 885 ft | May 9 | May 23 | 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 (3 mi S)
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 19 | May 13 | May 2 | September 24 | September 12 |
| 32°F | May 18 | May 9 | May 4 | April 21 | October 2 | September 22 |
| 28°F (hard freeze) | May 9 | April 30 | April 25 | April 10 | October 12 | September 29 |
| 24°F | April 30 | April 22 | April 16 | April 2 | October 23 | October 7 |
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.