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Will it freeze in Tualatin in the next 7 nights?
No overnight lows at or below 32°F are forecast in Tualatin 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 48°F Above 36°F · Chance Light Rain
- Sat, Nov 7 50°F Above 36°F · Light Rain
- Sun, Nov 8 42°F Above 36°F · Mostly Cloudy
- Mon, Nov 9 48°F Above 36°F · Light Rain Likely
- Tue, Nov 10 50°F Above 36°F · Chance Light Rain
- Wed, Nov 11 47°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 Tualatin
The median first fall hard-freeze date (28°F) is November 30, from NOAA’s 1991–2020 Climate Normals at Beaverton 2 Ssw. 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 11 · Apr 28 · May 16 | Oct 4 · Oct 21 · Nov 7 | 174 days |
| 32°F freeze | Mar 5 · Apr 1 · Apr 26 | Oct 19 · Nov 6 · Dec 1 | 222 days |
| 28°F hard freeze | Jan 23 · Feb 26 · Mar 26 | Nov 6 · Nov 30 · Dec 27 | 275 days |
Average high temperature by month
1991–2020 normals at Beaverton 2 Ssw
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 Tualatin, OR come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Beaverton 2 Ssw (station USC00350595, elevation 270 ft), 5.8 mi from Tualatin. 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 Tualatin
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| King City, OR | 2.5 mi | Apr 1 | Nov 6 |
| Tigard, OR | 3.1 mi | Apr 1 | Nov 6 |
| Sherwood, OR | 3.7 mi | Mar 21 | Nov 22 |
| Lake Oswego, OR | 4.3 mi | Mar 18 | Nov 18 |
| Wilsonville, OR | 4.3 mi | Mar 18 | Nov 13 |
| West Linn, OR | 6.8 mi | Mar 18 | Nov 18 |
| Beaverton, OR | 7.5 mi | Apr 1 | Nov 6 |
| Canby, OR | 8.7 mi | Mar 18 | Nov 13 |
| Milwaukie, OR | 8.7 mi | Feb 25 | Dec 1 |
| Gladstone, OR | 8.7 mi | Mar 18 | Nov 18 |
Frequently asked questions
When is the last frost in Tualatin?
On average, the last spring frost (32°F) in Tualatin is around April 1. In about 1 year in 10 it comes after April 26, and in 9 years in 10 it comes after March 5.
When is the first frost in Tualatin?
The first fall frost (32°F) usually arrives around November 6. There’s a 10% chance of a freeze by October 19 and a 90% chance by December 1.
Can it frost in Tualatin 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 28.
What growing zone is Tualatin?
Tualatin 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 97062. See growing zones in Oregon.
More: all Oregon frost dates · Oregon growing zones · UV index today in Tualatin · frost vs. freeze