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 66251
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 66251 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Overland Park, KS, is 6 miles from the ZIP's center: its last spring frost comes after April 10 in half of years and after April 24 in one year in ten. By the USDA's method its plant hardiness zone is 6b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Overland Park, KSOlathe (3 mi E) | 6 mi | 1,055 ft | April 10 | April 24 | October 29 | 6b |
| Olathe, KSOlathe Johnson County Exec Airport | 6 mi | 1,070 ft | April 8 | April 23 | October 29 | 6b |
| Olathe Johnson County Airport, KS | 14 mi | 1,087 ft | April 13 | April 29 | October 24 | 6b |
| Kansas City Downtown Airport, MO | 14 mi | 742 ft | April 4 | April 20 | November 2 | 6b |
| Lee's Summit, MOLees Summit Municipal Airport | 16 mi | 997 ft | April 7 | April 24 | October 29 | 6b |
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 Overland Park
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 2 | April 26 | April 19 | April 5 | October 20 | October 2 |
| 32°F | April 24 | April 16 | April 10 | March 27 | October 29 | October 13 |
| 28°F (hard freeze) | April 17 | April 7 | March 31 | March 13 | November 6 | October 23 |
| 24°F | April 6 | March 29 | March 20 | March 3 | November 15 | October 31 |
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.