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Will it freeze in St. Helens in the next 7 nights?
No overnight lows at or below 32°F are forecast in St. Helens 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.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 44°F Above 36°F · Mostly Cloudy then Slight Chance Light Rain
- Fri, Nov 6 49°F Above 36°F · Light Rain
- Sat, Nov 7 50°F Above 36°F · Light Rain
- Sun, Nov 8 43°F Above 36°F · Mostly Cloudy
- Mon, Nov 9 48°F Above 36°F · Light Rain Likely
- Tue, Nov 10 51°F Above 36°F · Light Rain Likely
- Wed, Nov 11 48°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 St. Helens
The median first fall hard-freeze date (28°F) is November 24, from NOAA’s 1991–2020 Climate Normals at Saint Helens Rfd. 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 18 · May 6 · Jun 9 | Oct 6 · Oct 24 · Nov 10 | 168 days |
| 32°F freeze | Mar 20 · Apr 18 · May 26 | Oct 21 · Nov 7 · Nov 26 | 201 days |
| 28°F hard freeze | Feb 20 · Mar 24 · May 6 | Nov 3 · Nov 24 · Dec 16 | 244 days |
Average high temperature by month
1991–2020 normals at Saint Helens Rfd
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 St. Helens, OR come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Saint Helens Rfd (station USC00357466, elevation 269 ft), 2.7 mi from St. Helens. 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 St. Helens
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Woodland, WA | 5.0 mi | Apr 18 | Nov 7 |
| Scappoose, OR | 7.5 mi | Apr 10 | Nov 2 |
| Ridgefield, WA | 7.5 mi | Apr 26 | Oct 16 |
| Battle Ground, WA | 14 mi | Apr 26 | Oct 16 |
| Kelso, WA | 18 mi | Apr 8 | Nov 5 |
| Vancouver, WA | 19 mi | Mar 29 | Nov 9 |
| Longview, WA | 21 mi | Apr 8 | Nov 5 |
| Hillsboro, OR | 24 mi | Apr 16 | Oct 23 |
| Portland, OR | 24 mi | Feb 25 | Dec 1 |
| Camas, WA | 25 mi | Mar 16 | Nov 20 |
Frequently asked questions
When is the last frost in St. Helens?
On average, the last spring frost (32°F) in St. Helens is around April 18. In about 1 year in 10 it comes after May 26, and in 9 years in 10 it comes after March 20.
When is the first frost in St. Helens?
The first fall frost (32°F) usually arrives around November 7. There’s a 10% chance of a freeze by October 21 and a 90% chance by November 26.
Can it frost in St. Helens 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 6.
What growing zone is St. Helens?
St. Helens 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 97018. See growing zones in Oregon.
More: all Oregon frost dates · Oregon growing zones · frost vs. freeze