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 55124
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 55124 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, Rosemount, MN, is 5 miles from the ZIP's center: its last spring frost comes after May 2 in half of years and after May 16 in one year in ten. By the USDA's method its plant hardiness zone is 4b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Rosemount, MNRosemount Research & Outreach Center | 5 mi | 945 ft | May 2 | May 16 | October 5 | 4b |
| Farmington, MN3 mi NW | 5 mi | 980 ft | April 27 | May 10 | October 10 | 5a |
| Minneapolis, MNMinneapolis/St Paul Airport | 10 mi | 872 ft | April 23 | May 7 | October 18 | 5a |
| St Paul (3 mi SW), MN | 13 mi | 925 ft | April 25 | May 9 | October 12 | – |
| Eden Prairie, MNMinneapolis Flying Cloud Airport | 15 mi | 907 ft | April 23 | May 6 | October 14 | 5a |
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 Rosemount
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 18 | May 12 | April 29 | September 28 | September 16 |
| 32°F | May 16 | May 8 | May 2 | April 19 | October 5 | September 22 |
| 28°F (hard freeze) | May 7 | April 28 | April 22 | April 8 | October 17 | October 2 |
| 24°F | April 27 | April 19 | April 12 | March 31 | October 27 | October 12 |
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.