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 65109
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 65109 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Jefferson City Water Treatment Plant, MO, is 5 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 |
|---|---|---|---|---|---|---|
| Jefferson City Water Treatment Plant, MO | 5 mi | 650 ft | April 8 | April 23 | October 31 | 6b |
| Jefferson City, MOJefferson City Memorial Airport | 7 mi | 573 ft | April 10 | April 25 | October 26 | 6b |
| California, MO | 16 mi | 879 ft | April 11 | April 27 | October 25 | 6b |
| Columbia, MOColumbia Regional Airport | 17 mi | 893 ft | April 7 | April 21 | October 29 | 6b |
| Eldon, MO | 23 mi | 924 ft | April 7 | April 27 | November 1 | – |
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 Jefferson City Water Treatment Plant
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 4 | April 27 | April 21 | April 4 | October 21 | October 7 |
| 32°F | April 23 | April 14 | April 8 | March 23 | October 31 | October 17 |
| 28°F (hard freeze) | April 13 | April 3 | March 28 | March 9 | November 8 | October 28 |
| 24°F | April 1 | March 24 | March 17 | February 28 | November 18 | November 4 |
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.