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 98203
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 98203 in zone 8b (the coldest night of a typical year: 15 to 20°F).
The nearest station, Everett station, WA, is 3 miles from the ZIP's center: its last spring frost comes after March 24 in half of years and after April 11 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Everett station, WA | 3 mi | 60 ft | March 24 | April 11 | November 2 | – |
| Everett, WAEverett Snohomish Airport | 3 mi | 606 ft | March 9 | March 29 | November 17 | 9a |
| Monroe, WA | 13 mi | 120 ft | April 17 | May 7 | October 23 | 8b |
| Seattle Sand Point Weather Office, WA | 18 mi | 60 ft | March 8 | March 29 | November 23 | 9a |
| Arlington, WA | 19 mi | 100 ft | April 22 | May 6 | October 19 | – |
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 Everett station
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 8 | April 29 | April 20 | March 31 | October 18 | October 1 |
| 32°F | April 11 | April 1 | March 24 | March 4 | November 2 | October 16 |
| 28°F (hard freeze) | March 20 | March 8 | March 1 | January 31 | November 21 | October 29 |
| 24°F | February 28 | February 17 | January 31 | December 15 | December 5 | November 12 |
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.