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 77545
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 77545 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Thompsons, TX, is 10 miles from the ZIP's center: its last spring frost comes after February 15 in half of years and after March 15 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 |
|---|---|---|---|---|---|---|
| Thompsons, TX3 mi WSW | 10 mi | 70 ft | February 15 | March 15 | December 6 | 9b |
| Houston Sugarland Mem, TX | 12 mi | 82 ft | February 2 | March 7 | December 11 | 9b |
| Sugar Land, TX | 12 mi | 84 ft | February 9 | March 11 | December 13 | – |
| Houston Hobby Airport, TX | 13 mi | 44 ft | January 30 | March 1 | December 28 | 9b |
| Houston Clover Field, TX | 14 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 Thompsons
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 1 | March 16 | March 6 | February 4 | November 22 | November 4 |
| 32°F | March 15 | March 1 | February 15 | January 13 | December 6 | November 13 |
| 28°F (hard freeze) | March 5 | February 8 | January 26 | December 21 | December 29 | November 29 |
| 24°F | March 1 | January 27 | January 13 | December 16 | January 4 | 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.