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Will it freeze in Sedro-Woolley in the next 7 nights?
No overnight lows at or below 32°F are forecast in Sedro-Woolley during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 44°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
1 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 44°F Above 36°F · Mostly Cloudy then Light Rain
- Fri, Nov 6 48°F Above 36°F · Light Rain Likely
- Sat, Nov 7 45°F Above 36°F · Light Rain then Showers And Thunderstorms
- Sun, Nov 8 35°F Frost possible · Slight Chance Light Rain then Partly Cloudy
- Mon, Nov 9 45°F Above 36°F · Light Rain
- Tue, Nov 10 48°F Above 36°F · Light Rain
- Wed, Nov 11 46°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 Sedro-Woolley
The median first fall hard-freeze date (28°F) is November 24, from NOAA’s 1991–2020 Climate Normals at Sedro-Woolley. 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 | Apr 1 · Apr 22 · May 11 | Oct 1 · Oct 17 · Nov 8 | 178 days |
| 32°F freeze | Mar 8 · Mar 27 · Apr 17 | Oct 15 · Nov 6 · Nov 28 | 224 days |
| 28°F hard freeze | Feb 2 · Mar 1 · Mar 22 | Nov 1 · Nov 24 · Dec 19 | 268 days |
Average high temperature by month
1991–2020 normals at Sedro-Woolley
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 Sedro-Woolley, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Sedro-Woolley (station USC00457507, elevation 60 ft), 1.1 mi from Sedro-Woolley. 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 Sedro-Woolley
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Burlington, WA | 5.6 mi | Mar 24 | Nov 3 |
| Mount Vernon, WA | 7.5 mi | Mar 24 | Nov 3 |
| Anacortes, WA | 18 mi | Mar 8 | Nov 20 |
| Stanwood, WA | 19 mi | Apr 22 | Oct 19 |
| Bellingham, WA | 20 mi | Apr 1 | Nov 2 |
| Oak Harbor, WA | 24 mi | Mar 13 | Nov 14 |
| Arlington, WA | 24 mi | Apr 22 | Oct 19 |
| Ferndale, WA | 29 mi | Mar 31 | Oct 30 |
| Marysville, WA | 30 mi | Mar 24 | Nov 2 |
| Lynden, WA | 32 mi | Apr 18 | Oct 18 |
Frequently asked questions
When is the last frost in Sedro-Woolley?
On average, the last spring frost (32°F) in Sedro-Woolley is around March 27. In about 1 year in 10 it comes after April 17, and in 9 years in 10 it comes after March 8.
When is the first frost in Sedro-Woolley?
The first fall frost (32°F) usually arrives around November 6. There’s a 10% chance of a freeze by October 15 and a 90% chance by November 28.
Can it frost in Sedro-Woolley 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 22.
What growing zone is Sedro-Woolley?
Sedro-Woolley is in USDA Plant Hardiness Zone 8b (average annual extreme minimum temperature 15 to 20°F), based on the 2023 USDA map for ZIP code 98235. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · frost vs. freeze