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 44502
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 44502 in zone 6a (the coldest night of a typical year: -10 to -5°F).
The nearest station, Youngstown, OH, is 12 miles from the ZIP's center: its last spring frost comes after May 1 in half of years and after May 20 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 |
|---|---|---|---|---|---|---|
| Youngstown, OHYoungstown Regional Airport | 12 mi | 1,180 ft | May 1 | May 20 | October 17 | 6b |
| Warren, OH3 mi S | 12 mi | 900 ft | May 8 | May 25 | October 12 | 6a |
| New Castle, PA1 mi N | 15 mi | 825 ft | April 30 | May 19 | October 23 | 6b |
| Mosquito Creek Lake, OH | 16 mi | 910 ft | April 30 | May 16 | October 23 | – |
| Mercer, PA | 23 mi | 1,220 ft | May 15 | June 1 | October 3 | – |
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 Youngstown
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 31 | May 22 | May 16 | April 27 | October 5 | September 22 |
| 32°F | May 20 | May 9 | May 1 | April 16 | October 17 | October 1 |
| 28°F (hard freeze) | May 7 | April 26 | April 20 | April 5 | November 1 | October 15 |
| 24°F | April 21 | April 14 | April 6 | March 24 | 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.