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 78628
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 78628 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Georgetown, TX, is 4 miles from the ZIP's center: its last spring frost comes after March 6 in half of years and after March 30 in one year in ten. By the USDA's method its plant hardiness zone is 8b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Georgetown, TXGeorgetown Lake | 4 mi | 874 ft | March 6 | March 30 | November 24 | 8b |
| Austin Great Hills, TX | 17 mi | 880 ft | March 11 | March 29 | November 20 | – |
| Austin (33 mi NW), TX | 18 mi | 1,361 ft | March 2 | March 20 | November 29 | – |
| Taylor, TX1 mi NW | 22 mi | 571 ft | March 8 | March 30 | November 21 | 9a |
| Austin, TXAustin-Camp Mabry | 24 mi | 670 ft | February 20 | March 14 | December 3 | 9a |
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 Georgetown
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 10 | March 31 | March 22 | March 1 | November 13 | October 31 |
| 32°F | March 30 | March 15 | March 6 | February 13 | November 24 | November 5 |
| 28°F (hard freeze) | March 16 | March 4 | February 23 | January 24 | December 5 | November 15 |
| 24°F | March 6 | February 19 | February 3 | December 31 | December 22 | November 27 |
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.