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 19602
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 19602 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Reading, PA, is 4 miles from the ZIP's center: its last spring frost comes after April 14 in half of years and after April 30 in one year in ten. By the USDA's method its plant hardiness zone is 7a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Reading, PAReading Regional Airport | 4 mi | 341 ft | April 14 | April 30 | October 29 | 7a |
| Blue Marsh Lake, PA | 7 mi | 350 ft | April 26 | May 12 | October 19 | 7a |
| Reading (4 mi NNW), PA | 7 mi | 360 ft | April 10 | April 26 | October 31 | 7a |
| Hopewell Morgantown, PA | 12 mi | 550 ft | April 16 | April 30 | October 27 | – |
| Hamburg, PA | 16 mi | 369 ft | April 16 | May 3 | October 25 | – |
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 Reading
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 13 | May 3 | April 28 | April 14 | October 17 | October 4 |
| 32°F | April 30 | April 21 | April 14 | April 1 | October 29 | October 13 |
| 28°F (hard freeze) | April 15 | April 6 | April 1 | March 17 | November 8 | October 25 |
| 24°F | April 3 | March 28 | March 21 | March 5 | November 21 | November 5 |
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.