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 95407
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 95407 in zone 9a (the coldest night of a typical year: 20 to 25°F).
The nearest station, Santa Rosa station, CA, is 5 miles from the ZIP's center: its last spring frost comes after February 25 in half of years and after March 29 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 |
|---|---|---|---|---|---|---|
| Santa Rosa station, CA | 5 mi | 166 ft | February 25 | March 29 | December 1 | 9b |
| Graton, CA | 7 mi | 200 ft | March 20 | April 19 | November 13 | 9a |
| Santa Rosa, CASanta Rosa Sonoma County Airport | 8 mi | 114 ft | March 2 | April 2 | November 20 | 9a |
| Occidental, CA | 12 mi | 865 ft | January 29 | March 17 | December 30 | – |
| Petaluma, CAPetaluma Airport | 12 mi | 20 ft | February 28 | April 6 | November 25 | 9b |
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 Santa Rosa 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 25 | April 12 | April 3 | March 6 | November 14 | October 31 |
| 32°F | March 29 | March 7 | February 25 | January 21 | December 1 | November 10 |
| 28°F (hard freeze) | February 24 | February 2 | January 20 | December 22 | December 16 | November 26 |
| 24°F | January 31 | January 12 | January 2 | December 10 | December 29 | December 3 |
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.