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Will it freeze in Sebastopol in the next 7 nights?
No overnight lows at or below 32°F are forecast in Sebastopol 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 41°F Above 36°F · Mostly Clear
- Sat, Nov 7 43°F Above 36°F · Patchy Fog
- Sun, Nov 8 44°F Above 36°F · Areas Of Fog
- Mon, Nov 9 43°F Above 36°F · Partly Cloudy then Areas Of Fog
- Tue, Nov 10 46°F Above 36°F · Areas Of Fog
- 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 Sebastopol
The median first fall hard-freeze date (28°F) is December 3, from NOAA’s 1991–2020 Climate Normals at Graton. 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 31 · Apr 23 · May 16 | Sep 29 · Oct 24 · Nov 11 | 182 days |
| 32°F freeze | Feb 12 · Mar 20 · Apr 19 | Oct 26 · Nov 13 · Dec 6 | 240 days |
| 28°F hard freeze | Dec 25 · Feb 1 · Mar 7 | Nov 12 · Dec 3 · Jan 8 | 307 days |
Average high temperature by month
1991–2020 normals at Graton
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 Sebastopol, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Graton (station USC00043578, elevation 200 ft), 2.9 mi from Sebastopol. 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 Sebastopol
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Santa Rosa, CA | 7.5 mi | Feb 25 | Dec 1 |
| Rohnert Park, CA | 7.5 mi | Feb 25 | Dec 1 |
| Cotati, CA | 8.1 mi | Feb 28 | Nov 25 |
| Windsor, CA | 9.9 mi | Mar 2 | Nov 20 |
| Petaluma, CA | 16 mi | Feb 28 | Nov 25 |
| Healdsburg, CA | 16 mi | Feb 15 | Dec 2 |
| St. Helena, CA | 21 mi | Feb 3 | Dec 4 |
| Sonoma, CA | 21 mi | Mar 2 | Nov 27 |
| Novato, CA | 27 mi | Jan 11 | Dec 21 |
| Cloverdale, CA | 29 mi | Feb 25 | Dec 3 |
Frequently asked questions
When is the last frost in Sebastopol?
On average, the last spring frost (32°F) in Sebastopol is around March 20. In about 1 year in 10 it comes after April 19, and in 9 years in 10 it comes after February 12.
When is the first frost in Sebastopol?
The first fall frost (32°F) usually arrives around November 13. There’s a 10% chance of a freeze by October 26 and a 90% chance by December 6.
Can it frost in Sebastopol 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 23.
What growing zone is Sebastopol?
Sebastopol 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 95472. See growing zones in California.
More: all California frost dates · California growing zones · frost vs. freeze