When is the first freeze in Seattle, WA?
NOAA's 1991-2020 climate normals for SEATTLE TACOMA INTL AP, WA US put the middle date for the first fall freeze (32°F or colder) at about Nov 23. The middle date for the first hard freeze (28°F or colder) is about Dec 10.
| First fall freeze (32°F), middle date | Nov 23 |
|---|---|
| First hard freeze (28°F), middle date | Dec 10 |
| Last spring freeze (32°F), middle date | Mar 2 |
| Chance of a 32°F night in a year | 100% |
| Weather station | SEATTLE TACOMA INTL AP, WA US (USW00024233) |
The middle date is NOAA's 50% date. In about half of years the first freeze comes sooner, and in half it comes later. One station can differ from nearby areas, mostly low or rural spots. Dates change each year, so check the latest National Weather Service forecast.
For HVAC and plumbing shops in Seattle
ForecastBooked watches the NWS forecast for the ZIPs you serve. When the first freeze is really in the forecast, a ready-to-send email, text, Google post and social post for your customers appears on your kit page. Pro and up also get a graphic.
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NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020, annual/seasonal normals, station USW00024233: fields ANN-TMIN-PRBFST-T32FP50, ANN-TMIN-PRBFST-T28FP50, ANN-TMIN-PRBLST-T32FP50, ANN-TMIN-PRBOCC-LSTH032. https://www.ncei.noaa.gov/data/normals-annualseasonal/1991-2020/access/USW00024233.csv. ForecastBooked is not affiliated with or endorsed by NOAA.