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 95688
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 95688 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Vacaville station, CA, is 4 miles from the ZIP's center: its last spring frost comes after January 31 in half of years and after March 11 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Vacaville station, CA | 4 mi | 110 ft | January 31 | March 11 | December 11 | – |
| Vacaville, CAVacaville Nut Tree Airport | 5 mi | 109 ft | February 18 | March 25 | November 28 | 9b |
| Lake Solano, CA | 5 mi | 187 ft | February 4 | March 9 | December 5 | 9b |
| Markley Cove, CA | 7 mi | 480 ft | March 6 | April 6 | November 30 | 9b |
| Winters, CA | 8 mi | 135 ft | February 18 | March 14 | November 30 | 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 Vacaville 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 7 | March 21 | March 8 | February 4 | November 26 | November 10 |
| 32°F | March 11 | February 15 | January 31 | December 30 | December 11 | November 24 |
| 28°F (hard freeze) | January 31 | January 17 | January 6 | December 16 | December 23 | December 4 |
| 24°F | January 16 | January 3 | December 30 | December 11 | December 28 | December 9 |
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.