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 16508
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 16508 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Erie, PA, is 5 miles from the ZIP's center: its last spring frost comes after April 26 in half of years and after May 13 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 |
|---|---|---|---|---|---|---|
| Erie, PAErie International Airport | 5 mi | 730 ft | April 26 | May 13 | November 4 | 7a |
| Union City, PAUnion City Filtration Plant | 18 mi | 1,400 ft | May 7 | May 24 | October 10 | – |
| Springboro, PA3 mi WNW | 26 mi | 1,005 ft | May 8 | May 23 | October 16 | 6a |
| Westfield, NY2 mi SSE | 29 mi | 707 ft | April 21 | May 5 | November 5 | – |
| Port Meadville Airport, PA | 33 mi | 1,400 ft | April 30 | May 18 | October 23 | 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 Erie
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 21 | May 14 | May 7 | April 23 | October 23 | October 8 |
| 32°F | May 13 | May 2 | April 26 | April 10 | November 4 | October 21 |
| 28°F (hard freeze) | April 25 | April 18 | April 11 | March 31 | November 16 | November 2 |
| 24°F | April 15 | April 5 | April 1 | March 16 | November 28 | November 12 |
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.