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 77449
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 77449 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Houston Sugarland Mem, TX, is 16 miles from the ZIP's center: its last spring frost comes after February 2 in half of years and after March 7 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 |
|---|---|---|---|---|---|---|
| Houston Sugarland Mem, TX | 16 mi | 82 ft | February 2 | March 7 | December 11 | 9b |
| Sugar Land, TX | 16 mi | 84 ft | February 9 | March 11 | December 13 | – |
| Houston Hooks Mem Airport, TX | 19 mi | 152 ft | February 19 | March 15 | December 3 | 9a |
| Houston, TXHouston Intercontinental Airport | 24 mi | 95 ft | February 13 | March 12 | December 9 | 9b |
| Sealy, TX | 25 mi | 196 ft | February 28 | March 21 | November 30 | – |
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 Houston Sugarland Mem
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 21 | March 7 | February 26 | January 25 | November 27 | November 7 |
| 32°F | March 7 | February 20 | February 2 | December 28 | December 11 | November 20 |
| 28°F (hard freeze) | February 23 | January 31 | January 18 | December 17 | January 1 | December 4 |
| 24°F | February 18 | January 25 | January 9 | December 20 | January 7 | December 16 |
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.