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 92880
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 92880 in zone 10a (the coldest night of a typical year: 30 to 35°F).
The nearest station, Chino, CA, is 4 miles from the ZIP's center: its last spring frost comes after January 17 in half of years and after February 22 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 |
|---|---|---|---|---|---|---|
| Chino, CAChino Airport | 4 mi | 650 ft | January 17 | February 22 | December 19 | 9b |
| Ontario, CAOntario International Airport | 9 mi | 949 ft | January 4 | February 7 | December 30 | 10a |
| Riverside, CARiverside Municipal Airport | 10 mi | 805 ft | January 9 | February 21 | December 30 | 10a |
| Riverside Fire Station 3, CA | 13 mi | 840 ft | January 9 | February 25 | December 25 | – |
| Pomona, CAPomona/Fairplex | 14 mi | 999 ft | January 8 | February 18 | December 28 | – |
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 Chino
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) | March 29 | March 6 | February 24 | January 21 | December 1 | November 12 |
| 32°F | February 22 | February 3 | January 17 | December 18 | December 19 | November 27 |
| 28°F (hard freeze) | January 28 | January 12 | January 3 | December 11 | December 30 | December 7 |
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.