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 54901
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 54901 in zone 5b (the coldest night of a typical year: -15 to -10°F).
The nearest station, Oshkosh station, WI, is 3 miles from the ZIP's center: its last spring frost comes after April 24 in half of years and after May 8 in one year in ten. By the USDA's method its plant hardiness zone is 5b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Oshkosh station, WI | 3 mi | 750 ft | April 24 | May 8 | October 20 | 5b |
| Oshkosh, WIOshkosh Wittman Airport | 6 mi | 782 ft | April 30 | May 13 | October 13 | 5b |
| Appleton, WI | 16 mi | 792 ft | May 4 | May 20 | October 6 | 5b |
| Ripon, WI5 mi NE | 16 mi | 930 ft | May 1 | May 14 | October 11 | – |
| Fond Du Lac Wastewater Treatment Plant, WI | 19 mi | 750 ft | May 1 | May 17 | October 12 | 5b |
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 Oshkosh station
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 19 | May 10 | May 4 | April 20 | October 6 | September 24 |
| 32°F | May 8 | April 30 | April 24 | April 10 | October 20 | October 4 |
| 28°F (hard freeze) | April 26 | April 18 | April 13 | March 31 | October 31 | October 17 |
| 24°F | April 17 | April 8 | April 3 | March 20 | November 10 | October 30 |
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.