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Will it freeze in Healdsburg in the next 7 nights?
No overnight lows at or below 32°F are forecast in Healdsburg during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 43°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 43°F Above 36°F · Mostly Clear
- Fri, Nov 6 43°F Above 36°F · Clear
- Sat, Nov 7 44°F Above 36°F · Mostly Clear
- Sun, Nov 8 45°F Above 36°F · Mostly Cloudy then Patchy Fog
- Mon, Nov 9 44°F Above 36°F · Mostly Clear then Patchy Fog
- Tue, Nov 10 46°F Above 36°F · Partly Cloudy then Patchy Fog
- Wed, Nov 11 44°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 Healdsburg
The median first fall hard-freeze date (28°F) is December 17, from NOAA’s 1991–2020 Climate Normals at Healdsburg. 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 | Feb 27 · Mar 29 · Apr 20 | Nov 1 · Nov 16 · Dec 2 | 234 days |
| 32°F freeze | Jan 4 · Feb 15 · Mar 17 | Nov 14 · Dec 2 · Jan 1 | 292 days |
| 28°F hard freeze | Dec 14 · Jan 7 · Feb 2 | Nov 28 · Dec 17 · Jan 12 | 347 days |
Average high temperature by month
1991–2020 normals at Healdsburg
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 Healdsburg, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Healdsburg (station USC00043875, elevation 177 ft), 0.5 mi from Healdsburg. 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 Healdsburg
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Windsor, CA | 6.2 mi | Mar 2 | Nov 20 |
| Cloverdale, CA | 14 mi | Feb 25 | Dec 3 |
| Santa Rosa, CA | 15 mi | Feb 25 | Dec 1 |
| Sebastopol, CA | 16 mi | Mar 20 | Nov 13 |
| Rohnert Park, CA | 21 mi | Feb 25 | Dec 1 |
| Cotati, CA | 22 mi | Feb 28 | Nov 25 |
| St. Helena, CA | 23 mi | Feb 3 | Dec 4 |
| Clearlake, CA | 27 mi | Apr 10 | Nov 6 |
| Lakeport, CA | 29 mi | Mar 5 | Nov 21 |
| Petaluma, CA | 29 mi | Feb 28 | Nov 25 |
Frequently asked questions
When is the last frost in Healdsburg?
On average, the last spring frost (32°F) in Healdsburg is around February 15. In about 1 year in 10 it comes after March 17, and in 9 years in 10 it comes after January 4.
When is the first frost in Healdsburg?
The first fall frost (32°F) usually arrives around December 2. There’s a 10% chance of a freeze by November 14 and a 90% chance by January 1.
Can it frost in Healdsburg 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 March 29.
What growing zone is Healdsburg?
Healdsburg is in USDA Plant Hardiness Zone 9b (average annual extreme minimum temperature 25 to 30°F), based on the 2023 USDA map for ZIP code 95448. See growing zones in California.
More: all California frost dates · California growing zones · frost vs. freeze