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 29730
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 29730 in zone 8a (the coldest night of a typical year: 10 to 15°F).
The nearest station, Winthrop University, SC, is 4 miles from the ZIP's center: its last spring frost comes after March 27 in half of years and after April 11 in one year in ten. By the USDA's method its plant hardiness zone is 8a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Winthrop University, SC | 4 mi | 650 ft | March 27 | April 11 | November 5 | 8a |
| Rock Hill, SCRock Hill York County Airport | 7 mi | 669 ft | March 31 | April 15 | November 4 | 8a |
| York, SC5 mi SSE | 10 mi | 660 ft | April 1 | April 14 | November 3 | – |
| Chester, SC1 mi SE | 17 mi | 560 ft | April 3 | April 19 | November 2 | 8a |
| Gastonia, NCGastonia Municipal Airport | 23 mi | 797 ft | March 24 | April 10 | November 9 | 8a |
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 Winthrop University
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) | April 23 | April 15 | April 9 | March 24 | October 27 | October 16 |
| 32°F | April 11 | April 2 | March 27 | March 10 | November 5 | October 24 |
| 28°F (hard freeze) | March 31 | March 22 | March 15 | February 23 | November 18 | November 2 |
| 24°F | March 22 | March 11 | March 1 | February 5 | December 5 | November 15 |
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.