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 93291
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 93291 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Visalia, CA, is 6 miles from the ZIP's center: its last spring frost comes after January 23 in half of years and after February 27 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 |
|---|---|---|---|---|---|---|
| Visalia, CA | 6 mi | 303 ft | January 23 | February 27 | December 13 | 9b |
| Hanford, CAHanford Municipal Airport | 15 mi | 249 ft | February 20 | March 21 | November 23 | 9a |
| Hanford (1 mi S), CA | 16 mi | 237 ft | February 7 | March 4 | December 1 | 9b |
| Lemon Cove, CA | 19 mi | 513 ft | February 5 | March 20 | December 8 | 9b |
| Lindsay, CA | 22 mi | 435 ft | February 20 | March 26 | 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 Visalia
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 2 | March 10 | February 27 | January 26 | November 29 | November 15 |
| 32°F | February 27 | February 2 | January 23 | December 29 | December 13 | November 27 |
| 28°F (hard freeze) | January 24 | January 11 | January 2 | December 16 | December 25 | 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.