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 98092
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 98092 in zone 8b (the coldest night of a typical year: 15 to 20°F).
The nearest station, Landsburg, WA, is 10 miles from the ZIP's center: its last spring frost comes after April 20 in half of years and after May 10 in one year in ten. By the USDA's method its plant hardiness zone is 8b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Landsburg, WA | 10 mi | 535 ft | April 20 | May 10 | October 25 | 8b |
| Buckley, WA1 mi NE | 10 mi | 685 ft | April 7 | April 27 | October 30 | 8b |
| Kent, WA | 10 mi | 30 ft | March 20 | April 8 | November 10 | 8b |
| McMillin, WAMcMillin Reservoir | 12 mi | 579 ft | April 11 | April 29 | October 30 | 8b |
| Palmer (3 mi ESE), WA | 13 mi | 920 ft | April 3 | May 2 | November 11 | 8b |
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 Landsburg
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) | June 7 | May 20 | May 10 | April 23 | October 6 | September 19 |
| 32°F | May 10 | April 29 | April 20 | March 31 | October 25 | October 5 |
| 28°F (hard freeze) | April 16 | April 2 | March 24 | February 28 | November 12 | October 24 |
| 24°F | March 18 | March 4 | February 22 | January 3 | December 1 | November 8 |
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.