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 66085
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 66085 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Olathe, KS, is 6 miles from the ZIP's center: its last spring frost comes after April 8 in half of years and after April 23 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 |
|---|---|---|---|---|---|---|
| Olathe, KSOlathe Johnson County Exec Airport | 6 mi | 1,070 ft | April 8 | April 23 | October 29 | 6b |
| Overland Park, KSOlathe (3 mi E) | 8 mi | 1,055 ft | April 10 | April 24 | October 29 | 6b |
| Olathe Johnson County Airport, KS | 13 mi | 1,087 ft | April 13 | April 29 | October 24 | 6b |
| Hillsdale, KSHillsdale Lake | 16 mi | 1,010 ft | April 9 | April 23 | October 31 | – |
| Lees Summit Reed Wildlife Refuge, MO | 17 mi | 1,000 ft | April 13 | April 28 | October 26 | – |
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 Olathe
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 3 | April 24 | April 18 | April 4 | October 19 | October 5 |
| 32°F | April 23 | April 15 | April 8 | March 23 | October 29 | October 15 |
| 28°F (hard freeze) | April 13 | April 4 | March 30 | March 11 | November 6 | October 25 |
| 24°F | April 4 | March 26 | March 18 | March 1 | November 15 | November 2 |
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.