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 92543
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 92543 in zone 9b (the coldest night of a typical year: 25 to 30°F).
The nearest station, Hemet, CA, is 6 miles from the ZIP's center: its last spring frost comes after January 10 in half of years and after February 25 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 |
|---|---|---|---|---|---|---|
| Hemet, CA | 6 mi | 1,811 ft | January 10 | February 25 | December 23 | 9b |
| San Jacinto, CA | 7 mi | 1,525 ft | January 31 | February 28 | December 10 | 9b |
| Idyllwild Fire Dept, CA | 16 mi | 5,380 ft | May 16 | June 5 | October 24 | 8a |
| Lake Elsinore, CAElsinore | 21 mi | 1,268 ft | January 28 | February 27 | December 18 | 9b |
| Fallbrook, CA5 mi NE | 22 mi | 1,140 ft | February 2 | February 24 | January 30 | – |
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 Hemet
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 6 | March 12 | February 21 | January 5 | December 9 | November 14 |
| 32°F | February 25 | January 31 | January 10 | December 14 | December 23 | November 27 |
| 28°F (hard freeze) | January 30 | December 31 | December 27 | December 3 | December 25 | 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.