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 55114
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 55114 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, University of Minnesota St Paul, MN, is 2 miles from the ZIP's center: its last spring frost comes after April 28 in half of years and after May 14 in one year in ten. By the USDA's method its plant hardiness zone is 5a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| University of Minnesota St Paul, MN | 2 mi | 970 ft | April 28 | May 14 | October 8 | 5a |
| Lower St Anthony Falls, MN | 3 mi | 754 ft | April 23 | May 7 | October 16 | 5a |
| St Paul (3 mi SW), MN | 3 mi | 925 ft | April 25 | May 9 | October 12 | – |
| Minneapolis, MNMinneapolis/St Paul Airport | 6 mi | 872 ft | April 23 | May 7 | October 18 | 5a |
| St. Paul, MNSt Paul Downtown Airport | 7 mi | 700 ft | April 24 | May 10 | October 16 | 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 University of Minnesota St Paul
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 13 | May 7 | April 25 | September 30 | September 18 |
| 32°F | May 14 | May 4 | April 28 | April 14 | October 8 | September 25 |
| 28°F (hard freeze) | May 1 | April 23 | April 18 | April 4 | October 21 | October 3 |
| 24°F | April 22 | April 13 | April 8 | March 26 | November 1 | October 17 |
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.