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Will it freeze in Seattle in the next 7 nights?
No overnight lows at or below 32°F are forecast in Seattle during the next 7 nights in the available NWS frost forecast.
Overnight: forecast low 50°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 3:00 AM PST to Thu, Nov 5, 6:00 AM PST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Overnight 50°F Above 36°F · Partly Cloudy
- Tonight 47°F Above 36°F · Mostly Cloudy then Chance Light Rain
- Fri, Nov 6 51°F Above 36°F · Light Rain
- Sat, Nov 7 51°F Above 36°F · Light Rain
- Sun, Nov 8 45°F Above 36°F · Partly Cloudy
- Mon, Nov 9 50°F Above 36°F · Light Rain
- Tue, Nov 10 52°F Above 36°F · Light Rain Likely
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Seattle
The median first fall hard-freeze date (28°F) is December 11, from NOAA’s 1991–2020 Climate Normals at Seattle Sand Point Wsfo. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Mar 17 · Apr 4 · Apr 26 | Oct 24 · Nov 5 · Nov 22 | 215 days |
| 32°F freeze | Feb 13 · Mar 8 · Mar 29 | Nov 4 · Nov 23 · Dec 16 | 259 days |
| 28°F hard freeze | Dec 27 · Feb 11 · Mar 1 | Nov 17 · Dec 11 · Jan 17 | 308 days |
Average high temperature by month
1991–2020 normals at Seattle Sand Point Wsfo
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Seattle, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Seattle Sand Point Wsfo (station USW00094290, elevation 60 ft), 6.5 mi from Seattle. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Seattle
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Mercer Island, WA | 6.8 mi | Mar 13 | Nov 17 |
| Bainbridge Island, WA | 7.5 mi | Mar 29 | Nov 14 |
| Kirkland, WA | 8.7 mi | Mar 8 | Nov 23 |
| Bellevue, WA | 9.3 mi | Mar 8 | Nov 23 |
| Shoreline, WA | 9.3 mi | Mar 8 | Nov 23 |
| Burien, WA | 9.9 mi | Mar 2 | Nov 23 |
| Lake Forest Park, WA | 9.9 mi | Mar 8 | Nov 23 |
| Kenmore, WA | 9.9 mi | Mar 8 | Nov 23 |
| Tukwila, WA | 11 mi | Mar 2 | Nov 23 |
| Newcastle, WA | 11 mi | Mar 13 | Nov 16 |
Frequently asked questions
When is the last frost in Seattle?
On average, the last spring frost (32°F) in Seattle is around March 8. In about 1 year in 10 it comes after March 29, and in 9 years in 10 it comes after February 13.
When is the first frost in Seattle?
The first fall frost (32°F) usually arrives around November 23. There’s a 10% chance of a freeze by November 4 and a 90% chance by December 16.
Can it frost in Seattle after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after April 4.
What growing zone is Seattle?
Seattle is in USDA Plant Hardiness Zone 9a (average annual extreme minimum temperature 20 to 25°F), based on the 2023 USDA map for ZIP code 98121. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · UV index today in Seattle · frost vs. freeze