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 93730
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 93730 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Friant, CA, is 7 miles from the ZIP's center: its last spring frost comes after March 9 in half of years and after April 16 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 |
|---|---|---|---|---|---|---|
| Friant, CAFriant Government Camp | 7 mi | 410 ft | March 9 | April 16 | December 1 | 9b |
| Fresno, CAFresno Yosemite Int'l | 9 mi | 333 ft | January 14 | February 11 | December 14 | 9b |
| Fresno (5 mi NE), CA | 10 mi | 338 ft | January 30 | March 4 | December 11 | – |
| Madera station, CA | 16 mi | 270 ft | February 18 | March 18 | November 27 | – |
| Auberry, CA2 mi NW | 18 mi | 2,090 ft | March 25 | April 22 | December 3 | 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 Friant
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) | May 4 | April 23 | April 15 | March 21 | November 15 | October 29 |
| 32°F | April 16 | March 31 | March 9 | January 22 | December 1 | November 12 |
| 28°F (hard freeze) | February 28 | February 1 | January 19 | December 19 | December 13 | November 24 |
| 24°F | January 24 | January 9 | December 31 | December 4 | December 22 | 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.