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 43229
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 43229 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Westerville, OH, is 3 miles from the ZIP's center: its last spring frost comes after April 22 in half of years and after May 10 in one year in ten. By the USDA's method its plant hardiness zone is 6a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Westerville, OH | 3 mi | 802 ft | April 22 | May 10 | October 24 | 6a |
| Columbus WCMH, OH | 5 mi | 740 ft | April 20 | May 7 | October 24 | – |
| Columbus Ohio State University Airport, OH | 5 mi | 905 ft | April 22 | May 9 | October 23 | 6b |
| Columbus, OHColumbus Port Columbus International Airport | 8 mi | 810 ft | April 18 | May 5 | October 27 | 6b |
| Columbus-Valley Crossing, OH | 13 mi | 760 ft | April 23 | May 8 | October 19 | – |
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 Westerville
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 21 | May 10 | May 2 | April 19 | October 12 | September 27 |
| 32°F | May 10 | April 28 | April 22 | April 9 | October 24 | October 10 |
| 28°F (hard freeze) | April 24 | April 17 | April 9 | March 27 | November 3 | October 21 |
| 24°F | April 11 | April 3 | March 29 | March 13 | November 14 | November 1 |
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.