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Will it freeze in Mount Vernon in the next 7 nights?
No overnight lows at or below 32°F are forecast in Mount Vernon during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 47°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 47°F Above 36°F · Mostly Cloudy then Light Rain
- Fri, Nov 6 50°F Above 36°F · Light Rain Likely
- Sat, Nov 7 47°F Above 36°F · Light Rain then Showers And Thunderstorms
- Sun, Nov 8 37°F Above 36°F · Slight Chance Light Rain then Partly Cloudy
- Mon, Nov 9 47°F Above 36°F · Light Rain
- Tue, Nov 10 49°F Above 36°F · Light Rain Likely
- Wed, Nov 11 47°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 Mount Vernon
The median first fall hard-freeze date (28°F) is November 25, from NOAA’s 1991–2020 Climate Normals at Mt Vernon 3 Wnw. 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 29 · Apr 18 · May 5 | Sep 29 · Oct 16 · Nov 6 | 182 days |
| 32°F freeze | Mar 3 · Mar 24 · Apr 14 | Oct 12 · Nov 3 · Nov 25 | 224 days |
| 28°F hard freeze | Jan 23 · Feb 27 · Mar 17 | Oct 31 · Nov 25 · Dec 23 | 273 days |
Average high temperature by month
1991–2020 normals at Mt Vernon 3 Wnw
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 Mount Vernon, WA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Mt Vernon 3 Wnw (station USC00455678, elevation 14 ft), 3.8 mi from Mount Vernon. 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 Mount Vernon
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Burlington, WA | 3.7 mi | Mar 24 | Nov 3 |
| Sedro-Woolley, WA | 7.5 mi | Mar 27 | Nov 6 |
| Stanwood, WA | 12 mi | Apr 22 | Oct 19 |
| Anacortes, WA | 15 mi | Mar 8 | Nov 20 |
| Oak Harbor, WA | 17 mi | Mar 13 | Nov 14 |
| Arlington, WA | 19 mi | Apr 22 | Oct 19 |
| Bellingham, WA | 24 mi | Apr 1 | Nov 2 |
| Marysville, WA | 24 mi | Mar 24 | Nov 2 |
| Port Townsend, WA | 30 mi | Mar 1 | Nov 28 |
| Lake Stevens, WA | 30 mi | Mar 24 | Nov 2 |
Frequently asked questions
When is the last frost in Mount Vernon?
On average, the last spring frost (32°F) in Mount Vernon is around March 24. In about 1 year in 10 it comes after April 14, and in 9 years in 10 it comes after March 3.
When is the first frost in Mount Vernon?
The first fall frost (32°F) usually arrives around November 3. There’s a 10% chance of a freeze by October 12 and a 90% chance by November 25.
Can it frost in Mount Vernon 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 18.
What growing zone is Mount Vernon?
Mount Vernon 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 98273. See growing zones in Washington.
More: all Washington frost dates · Washington growing zones · UV index today in Mount Vernon · frost vs. freeze