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 54603
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 54603 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, La Crosse, WI, is 1 miles from the ZIP's center: its last spring frost comes after April 23 in half of years and after May 6 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 |
|---|---|---|---|---|---|---|
| La Crosse, WILa Crosse Regional Airport | 1 mi | 652 ft | April 23 | May 6 | October 17 | 5a |
| La Crescent, MNLa Crescent Dam 7 | 3 mi | 647 ft | April 15 | May 1 | October 28 | – |
| La Crosse Weather Office, WI | 4 mi | 1,307 ft | April 27 | May 12 | October 13 | 5a |
| Trempealeau, WITrempealeau Dam 6 | 13 mi | 660 ft | April 29 | May 13 | October 11 | 5a |
| Genoa, WIGenoa Dam 8 | 20 mi | 639 ft | April 22 | May 5 | October 17 | 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 La Crosse
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 17 | May 9 | May 4 | April 21 | October 6 | September 24 |
| 32°F | May 6 | April 30 | April 23 | April 9 | October 17 | October 3 |
| 28°F (hard freeze) | April 27 | April 18 | April 12 | March 31 | October 28 | October 15 |
| 24°F | April 16 | April 7 | April 2 | March 19 | November 7 | October 27 |
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.