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 29455
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 29455 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Charleston City, SC, is 11 miles from the ZIP's center: its last spring frost comes after February 4 in half of years and after March 4 in one year in ten. By the USDA's method its plant hardiness zone is 9b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Charleston City, SC | 11 mi | 10 ft | February 4 | March 4 | December 30 | 9b |
| Edisto Island Middleton Plantation, SC | 15 mi | 12 ft | March 1 | March 22 | December 6 | – |
| Sullivan's Island, SCSullivans Island | 15 mi | 5 ft | March 13 | March 30 | November 30 | – |
| Charleston, SCCharleston International Airport | 15 mi | 40 ft | March 7 | March 27 | November 27 | 9a |
| Edisto Beach, SCEdisto Beach State Park | 17 mi | 5 ft | March 1 | March 21 | December 6 | – |
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 Charleston City
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) | March 17 | March 6 | February 25 | January 29 | December 10 | November 20 |
| 32°F | March 4 | February 17 | February 4 | January 5 | December 30 | December 2 |
| 28°F (hard freeze) | February 20 | February 1 | January 24 | December 27 | January 8 | December 15 |
| 24°F | February 10 | January 28 | January 18 | December 30 | January 15 | December 22 |
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.