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 66109
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 66109 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Bonner Springs, KS, is 8 miles from the ZIP's center: its last spring frost comes after April 16 in half of years and after May 1 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Bonner Springs, KS | 8 mi | 850 ft | April 16 | May 1 | October 22 | – |
| Leavenworth (3 mi SW), KS | 10 mi | 871 ft | April 19 | May 4 | October 19 | – |
| Kansas City, MOKansas City International Airport | 11 mi | 1,005 ft | April 13 | April 29 | October 24 | 6a |
| Leavenworth, KS | 12 mi | 870 ft | April 12 | April 25 | October 27 | – |
| Kansas City Downtown Airport, MO | 13 mi | 742 ft | April 4 | April 20 | November 2 | 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 Bonner Springs
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 9 | May 2 | April 28 | April 12 | October 13 | September 29 |
| 32°F | May 1 | April 23 | April 16 | April 1 | October 22 | October 9 |
| 28°F (hard freeze) | April 22 | April 11 | April 5 | March 19 | October 31 | October 17 |
| 24°F | April 12 | April 2 | March 27 | March 8 | November 9 | 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.