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 78641
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 78641 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Austin (33 mi NW), TX, is 11 miles from the ZIP's center: its last spring frost comes after March 2 in half of years and after March 20 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Austin (33 mi NW), TX | 11 mi | 1,361 ft | March 2 | March 20 | November 29 | – |
| Austin Great Hills, TX | 13 mi | 880 ft | March 11 | March 29 | November 20 | – |
| Georgetown, TXGeorgetown Lake | 14 mi | 874 ft | March 6 | March 30 | November 24 | 8b |
| Austin, TXAustin-Camp Mabry | 19 mi | 670 ft | February 20 | March 14 | December 3 | 9a |
| Burnet, TXBurnet Municipal Airport | 23 mi | 1,288 ft | March 6 | March 28 | November 23 | 8b |
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 Austin (33 mi NW)
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 14 | February 25 | November 18 | November 2 |
| 32°F | March 20 | March 9 | March 2 | February 6 | November 29 | November 10 |
| 28°F (hard freeze) | March 11 | February 28 | February 16 | January 12 | December 13 | November 20 |
| 24°F | March 2 | February 13 | January 29 | December 20 | December 30 | 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.