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 57104
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 57104 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, Sioux Falls, SD, is 2 miles from the ZIP's center: its last spring frost comes after May 1 in half of years and after May 14 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 |
|---|---|---|---|---|---|---|
| Sioux Falls, SDSioux Falls Foss Field | 2 mi | 1,430 ft | May 1 | May 14 | October 6 | 5a |
| Sioux Falls Weather Office Airport, SD | 2 mi | 1,430 ft | April 26 | May 9 | October 13 | – |
| Sioux Falls (14 mi NNE), SD | 10 mi | 1,594 ft | May 1 | May 15 | October 4 | – |
| Canton, SD | 21 mi | 1,316 ft | May 2 | May 15 | October 2 | 4b |
| Montrose, SD8 mi N | 29 mi | 1,718 ft | May 3 | May 15 | October 4 | – |
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 Sioux Falls
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 23 | May 15 | May 10 | April 29 | September 27 | September 14 |
| 32°F | May 14 | May 6 | May 1 | April 18 | October 6 | September 23 |
| 28°F (hard freeze) | May 5 | April 28 | April 22 | April 8 | October 17 | October 1 |
| 24°F | April 27 | April 19 | April 13 | March 30 | October 27 | October 13 |
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.