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Will it freeze in Wilsonville in the next 7 nights?
No overnight lows at or below 32°F are forecast in Wilsonville during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 42°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 42°F Above 36°F · Patchy Fog
- Fri, Nov 6 47°F Above 36°F · Chance Light Rain
- Sat, Nov 7 49°F Above 36°F · Light Rain
- Sun, Nov 8 42°F Above 36°F · Mostly Cloudy
- Mon, Nov 9 47°F Above 36°F · Light Rain Likely
- Tue, Nov 10 49°F Above 36°F · Chance Light Rain
- Wed, Nov 11 46°F Above 36°F · Chance Light Rain
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 Wilsonville
The median first fall hard-freeze date (28°F) is December 1, from NOAA’s 1991–2020 Climate Normals at N Willamette Experiment Station. 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 17 · May 6 | Oct 11 · Oct 27 · Nov 15 | 193 days |
| 32°F freeze | Feb 22 · Mar 18 · Apr 10 | Oct 27 · Nov 13 · Dec 6 | 243 days |
| 28°F hard freeze | Dec 30 · Feb 13 · Mar 10 | Nov 9 · Dec 1 · Dec 31 | 298 days |
Average high temperature by month
1991–2020 normals at N Willamette Experiment Station
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 Wilsonville, OR come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: N Willamette Experiment Station (station USC00356151, elevation 150 ft), 2.2 mi from Wilsonville. 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 Wilsonville
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Tualatin, OR | 4.3 mi | Apr 1 | Nov 6 |
| Sherwood, OR | 5.0 mi | Mar 21 | Nov 22 |
| Canby, OR | 5.0 mi | Mar 18 | Nov 13 |
| King City, OR | 6.2 mi | Apr 1 | Nov 6 |
| West Linn, OR | 7.5 mi | Mar 18 | Nov 18 |
| Tigard, OR | 7.5 mi | Apr 1 | Nov 6 |
| Lake Oswego, OR | 8.1 mi | Mar 18 | Nov 18 |
| Oregon City, OR | 8.7 mi | Mar 18 | Nov 18 |
| Newberg, OR | 9.3 mi | Mar 21 | Nov 22 |
| Gladstone, OR | 9.9 mi | Mar 18 | Nov 18 |
Frequently asked questions
When is the last frost in Wilsonville?
On average, the last spring frost (32°F) in Wilsonville is around March 18. In about 1 year in 10 it comes after April 10, and in 9 years in 10 it comes after February 22.
When is the first frost in Wilsonville?
The first fall frost (32°F) usually arrives around November 13. There’s a 10% chance of a freeze by October 27 and a 90% chance by December 6.
Can it frost in Wilsonville 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 17.
What growing zone is Wilsonville?
Wilsonville 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 97070. See growing zones in Oregon.
More: all Oregon frost dates · Oregon growing zones · UV index today in Wilsonville · frost vs. freeze