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 55318
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 55318 in zone 4b (the coldest night of a typical year: -25 to -20°F).
The nearest station, Chaska, MN, is 0 miles from the ZIP's center: its last spring frost comes after May 5 in half of years and after May 19 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Chaska, MN2 mi NW | 0 mi | 923 ft | May 5 | May 19 | October 5 | – |
| Chanhassen, MNChanhassen Weather Office | 4 mi | 946 ft | April 30 | May 15 | October 9 | 4b |
| Eden Prairie, MNMinneapolis Flying Cloud Airport | 8 mi | 907 ft | April 23 | May 6 | October 14 | 5a |
| Jordan, MN1 mi SSW | 11 mi | 900 ft | May 2 | May 18 | October 5 | 5a |
| Delano, MN | 18 mi | 975 ft | April 30 | May 14 | October 8 | – |
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 Chaska
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 29 | May 21 | May 16 | May 4 | September 27 | September 15 |
| 32°F | May 19 | May 10 | May 5 | April 21 | October 5 | September 22 |
| 28°F (hard freeze) | May 6 | April 29 | April 23 | April 8 | October 16 | October 1 |
| 24°F | April 26 | April 18 | April 12 | April 1 | October 26 | 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.