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Will it freeze in Forest Grove in the next 7 nights?
No overnight lows at or below 32°F are forecast in Forest Grove during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 40°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 40°F Above 36°F · Patchy Fog
- Fri, Nov 6 46°F Above 36°F · Light Rain Likely
- Sat, Nov 7 47°F Above 36°F · Light Rain
- Sun, Nov 8 39°F Above 36°F · Mostly Cloudy
- Mon, Nov 9 45°F Above 36°F · Light Rain Likely
- Tue, Nov 10 48°F Above 36°F · Chance Light Rain
- Wed, Nov 11 45°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 Forest Grove
The median first fall hard-freeze date (28°F) is November 11, from NOAA’s 1991–2020 Climate Normals at Forest Grove. 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 19 · May 4 · May 25 | Sep 24 · Oct 8 · Oct 30 | 155 days |
| 32°F freeze | Mar 26 · Apr 16 · May 5 | Oct 6 · Oct 26 · Nov 14 | 192 days |
| 28°F hard freeze | Feb 21 · Mar 19 · Apr 12 | Oct 23 · Nov 11 · Dec 5 | 236 days |
Average high temperature by month
1991–2020 normals at Forest Grove
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 Forest Grove, OR come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Forest Grove (station USC00352997, elevation 180 ft), 0.4 mi from Forest Grove. 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 Forest Grove
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Cornelius, OR | 3.1 mi | Apr 16 | Oct 26 |
| Hillsboro, OR | 8.7 mi | Apr 16 | Oct 23 |
| Beaverton, OR | 14 mi | Apr 1 | Nov 6 |
| Newberg, OR | 17 mi | Mar 21 | Nov 22 |
| King City, OR | 17 mi | Apr 1 | Nov 6 |
| Tigard, OR | 17 mi | Apr 1 | Nov 6 |
| Sherwood, OR | 17 mi | Mar 21 | Nov 22 |
| Tualatin, OR | 19 mi | Apr 1 | Nov 6 |
| Scappoose, OR | 20 mi | Apr 10 | Nov 2 |
| Lake Oswego, OR | 21 mi | Mar 18 | Nov 18 |
Frequently asked questions
When is the last frost in Forest Grove?
On average, the last spring frost (32°F) in Forest Grove is around April 16. In about 1 year in 10 it comes after May 5, and in 9 years in 10 it comes after March 26.
When is the first frost in Forest Grove?
The first fall frost (32°F) usually arrives around October 26. There’s a 10% chance of a freeze by October 6 and a 90% chance by November 14.
Can it frost in Forest Grove 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 May 4.
What growing zone is Forest Grove?
Forest Grove 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 97113. See growing zones in Oregon.
More: all Oregon frost dates · Oregon growing zones · UV index today in Forest Grove · frost vs. freeze