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 94972
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 94972 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Occidental, CA, is 4 miles from the ZIP's center: its last spring frost comes after January 29 in half of years and after March 17 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Occidental, CA | 4 mi | 865 ft | January 29 | March 17 | December 30 | – |
| Bodega, CA6 mi WSW | 7 mi | 63 ft | January 1 | February 24 | December 31 | – |
| Graton, CA | 8 mi | 200 ft | March 20 | April 19 | November 13 | 9a |
| Santa Rosa, CASanta Rosa Sonoma County Airport | 14 mi | 114 ft | March 2 | April 2 | November 20 | 9a |
| Santa Rosa station, CA | 15 mi | 166 ft | February 25 | March 29 | December 1 | 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 Occidental
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 24 | April 9 | March 24 | February 3 | December 8 | November 20 |
| 32°F | March 17 | February 27 | January 29 | December 17 | December 30 | December 1 |
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.