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 15632
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 15632 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Salina (3 mi W), PA, is 6 miles from the ZIP's center: its last spring frost comes after April 29 in half of years and after May 17 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 |
|---|---|---|---|---|---|---|
| Salina (3 mi W), PA | 6 mi | 1,109 ft | April 29 | May 17 | October 20 | 6a |
| Murrysville, PA2 mi SW | 6 mi | 860 ft | April 22 | May 12 | October 25 | – |
| Loyalhanna, PALoyalhanna Lake | 8 mi | 990 ft | May 2 | May 18 | October 14 | – |
| Acmetonia Lock 3, PA | 13 mi | 748 ft | April 16 | May 4 | November 1 | – |
| Braddock, PABraddock Lock 2 | 14 mi | 730 ft | April 5 | April 22 | November 10 | – |
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 Salina (3 mi W)
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 28 | May 18 | May 10 | April 24 | October 7 | September 25 |
| 32°F | May 17 | May 5 | April 29 | April 14 | October 20 | October 5 |
| 28°F (hard freeze) | May 4 | April 24 | April 18 | April 1 | November 1 | October 16 |
| 24°F | April 19 | April 11 | April 5 | March 22 | November 12 | 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.