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 94566
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 94566 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Livermore station, CA, is 4 miles from the ZIP's center: its last spring frost comes after February 15 in half of years and after March 13 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 |
|---|---|---|---|---|---|---|
| Livermore station, CA | 4 mi | 393 ft | February 15 | March 13 | December 2 | 9b |
| Livermore, CALivermore Municipal Airport | 4 mi | 393 ft | February 27 | March 29 | December 1 | 9b |
| Fremont, CA | 12 mi | 38 ft | January 7 | February 7 | December 22 | 10a |
| Newark, CA | 14 mi | 10 ft | January 1 | January 22 | December 27 | 10a |
| Hayward, CAHayward Air Terminal | 15 mi | 43 ft | January 2 | January 27 | December 25 | 10a |
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 Livermore station
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 13 | April 3 | March 25 | February 26 | November 18 | November 4 |
| 32°F | March 13 | February 28 | February 15 | January 12 | December 2 | November 16 |
| 28°F (hard freeze) | February 10 | January 24 | January 10 | December 19 | December 18 | November 29 |
| 24°F | January 20 | January 9 | January 1 | December 13 | December 30 | December 7 |
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.