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 15902
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 15902 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Johnstown, PA, is 2 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 6b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Johnstown, PAJohnstown Cambria County Airport | 2 mi | 2,284 ft | April 29 | May 17 | October 21 | 6b |
| Ebensburg, PAEbensburg Sewage Plant | 13 mi | 1,940 ft | May 17 | June 1 | October 2 | 6a |
| Laurel Summit, PA | 18 mi | 2,730 ft | May 6 | May 23 | October 12 | 6a |
| Laurel Mountain, PA | 19 mi | 2,760 ft | April 26 | May 13 | October 17 | – |
| Shawnee State Park, PA | 23 mi | 1,275 ft | May 4 | May 21 | October 10 | 6b |
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 Johnstown
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 24 | May 16 | May 8 | April 22 | October 8 | September 24 |
| 32°F | May 17 | May 5 | April 29 | April 14 | October 21 | October 5 |
| 28°F (hard freeze) | May 5 | April 23 | April 17 | April 1 | November 2 | October 19 |
| 24°F | April 20 | April 11 | April 4 | March 20 | 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.