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 77550
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 77550 in zone 10a (the coldest night of a typical year: 30 to 35°F).
The nearest station, Galveston station, TX, is 2 miles from the ZIP's center: its last spring frost comes after January 25 in half of years and after February 21 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Galveston station, TX | 2 mi | 7 ft | January 25 | February 21 | January 1 | – |
| Galveston, TXGalveston Scholes Field | 6 mi | 5 ft | January 18 | February 18 | January 7 | 10a |
| League City, TXHouston Nwso | 22 mi | 19 ft | January 31 | March 5 | December 14 | 9b |
| Alvin, TX | 28 mi | 28 ft | February 14 | March 13 | December 5 | – |
| Houston Clover Field, TX | 32 mi | 44 ft | January 31 | March 5 | December 27 | 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 Galveston station
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 8 | February 22 | February 8 | January 4 | December 19 | November 27 |
| 32°F | February 21 | February 2 | January 25 | December 23 | January 1 | December 9 |
| 28°F (hard freeze) | February 8 | January 27 | January 17 | December 22 | January 5 | December 14 |
| 24°F | February 2 | January 24 | January 17 | January 3 | January 12 | January 2 |
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.