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 66027
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 66027 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Leavenworth, KS, is 2 miles from the ZIP's center: its last spring frost comes after April 12 in half of years and after April 25 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Leavenworth, KS | 2 mi | 870 ft | April 12 | April 25 | October 27 | – |
| Leavenworth (3 mi SW), KS | 6 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 |
| Atchison, KS | 18 mi | 945 ft | April 11 | April 23 | October 29 | 6b |
| Smithville, MOSmithville Lake | 20 mi | 904 ft | April 18 | May 3 | October 20 | – |
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 Leavenworth
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 27 | April 21 | April 8 | October 18 | October 1 |
| 32°F | April 25 | April 17 | April 12 | March 31 | October 27 | October 13 |
| 28°F (hard freeze) | April 17 | April 8 | April 3 | March 18 | November 4 | October 23 |
| 24°F | April 7 | March 31 | March 25 | March 8 | November 13 | 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.