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 77441
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 77441 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Sealy, TX, is 15 miles from the ZIP's center: its last spring frost comes after February 28 in half of years and after March 21 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Sealy, TX | 15 mi | 196 ft | February 28 | March 21 | November 30 | – |
| Sugar Land, TX | 16 mi | 84 ft | February 9 | March 11 | December 13 | – |
| Houston Sugarland Mem, TX | 16 mi | 82 ft | February 2 | March 7 | December 11 | 9b |
| Thompsons, TX3 mi WSW | 22 mi | 70 ft | February 15 | March 15 | December 6 | 9b |
| Eagle Lake, TXEagle Lake Resch Center | 28 mi | 176 ft | February 21 | March 14 | December 1 | – |
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 Sealy
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 5 | March 23 | March 13 | February 20 | November 17 | November 1 |
| 32°F | March 21 | March 8 | February 28 | January 30 | November 30 | November 9 |
| 28°F (hard freeze) | March 9 | February 25 | February 10 | January 2 | December 20 | November 20 |
| 24°F | March 1 | February 9 | January 28 | December 22 | January 5 | December 4 |
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.