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 78373
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 78373 in zone 10a (the coldest night of a typical year: 30 to 35°F).
The nearest station, Port Aransas (11 mi SSW), TX, is 6 miles from the ZIP's center: its last spring frost comes after January 22 in half of years and after March 3 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Port Aransas (11 mi SSW), TX | 6 mi | 6 ft | January 22 | March 3 | January 4 | – |
| Port Aransas, TX | 6 mi | 12 ft | January 16 | February 23 | January 5 | – |
| Corpus Christi Naval Air Station, TX | 11 mi | 18 ft | January 14 | February 20 | January 8 | – |
| Rockport station, TX | 17 mi | 8 ft | January 31 | February 28 | December 25 | 9b |
| C C Botanical Gardens, TX | 18 mi | 16 ft | January 29 | March 1 | December 24 | 9b |
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 Port Aransas (11 mi SSW)
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 10 | February 23 | February 3 | December 31 | December 27 | November 30 |
| 32°F | March 3 | February 4 | January 22 | December 16 | January 4 | December 6 |
| 28°F (hard freeze) | March 1 | January 26 | January 12 | December 14 | January 6 | December 10 |
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.