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 55429
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 55429 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, Minneapolis Crystal Airport, MN, is 0 miles from the ZIP's center: its last spring frost comes after April 30 in half of years and after May 17 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 |
|---|---|---|---|---|---|---|
| Minneapolis Crystal Airport, MN | 0 mi | 861 ft | April 30 | May 17 | October 8 | 5a |
| New Hope, MN | 4 mi | 910 ft | April 29 | May 12 | October 12 | 5a |
| Lower St Anthony Falls, MN | 7 mi | 754 ft | April 23 | May 7 | October 16 | 5a |
| University of Minnesota St Paul, MN | 9 mi | 970 ft | April 28 | May 14 | October 8 | 5a |
| Vadnais Lake, MN | 12 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 Minneapolis Crystal Airport
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 17 | May 9 | April 27 | September 29 | September 18 |
| 32°F | May 17 | May 6 | April 30 | April 17 | October 8 | September 26 |
| 28°F (hard freeze) | May 5 | April 26 | April 20 | April 5 | October 18 | October 4 |
| 24°F | April 23 | April 15 | April 9 | March 28 | October 30 | October 14 |
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.