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 44903
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 44903 in zone 6a (the coldest night of a typical year: -10 to -5°F).
The nearest station, Mansfield, OH, is 3 miles from the ZIP's center: its last spring frost comes after April 26 in half of years and after May 12 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 |
|---|---|---|---|---|---|---|
| Mansfield, OHMansfield Lahm Regional Airport | 3 mi | 1,295 ft | April 26 | May 12 | October 22 | 6a |
| Mansfield (5 mi W), OH | 5 mi | 1,350 ft | April 30 | May 17 | October 15 | – |
| Ashland, OH2 mi SW | 10 mi | 1,265 ft | April 30 | May 15 | October 15 | – |
| Galion, OHGalion Water Works | 15 mi | 1,170 ft | April 26 | May 11 | October 20 | – |
| Bucyrus, OH | 23 mi | 955 ft | April 19 | May 6 | October 27 | 6a |
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 Mansfield
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 22 | May 13 | May 6 | April 22 | October 9 | September 26 |
| 32°F | May 12 | May 2 | April 26 | April 14 | October 22 | October 6 |
| 28°F (hard freeze) | May 2 | April 21 | April 16 | April 1 | November 2 | October 19 |
| 24°F | April 19 | April 9 | April 3 | March 18 | November 12 | 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.