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 55130
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 55130 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, St. Paul, MN, is 3 miles from the ZIP's center: its last spring frost comes after April 24 in half of years and after May 10 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 |
|---|---|---|---|---|---|---|
| St. Paul, MNSt Paul Downtown Airport | 3 mi | 700 ft | April 24 | May 10 | October 16 | 5a |
| St Paul station, MN | 3 mi | 900 ft | April 26 | May 11 | October 12 | – |
| St Paul (3 mi SW), MN | 5 mi | 925 ft | April 25 | May 9 | October 12 | – |
| University of Minnesota St Paul, MN | 5 mi | 970 ft | April 28 | May 14 | October 8 | 5a |
| Vadnais Lake, MN | 5 mi | 890 ft | April 23 | May 7 | October 20 | 4b |
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 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 18 | May 10 | May 4 | April 20 | October 5 | September 23 |
| 32°F | May 10 | April 30 | April 24 | April 9 | October 16 | October 2 |
| 28°F (hard freeze) | April 28 | April 19 | April 13 | April 1 | October 27 | October 11 |
| 24°F | April 17 | April 9 | April 4 | March 22 | November 4 | October 22 |
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.