Checking current alerts… View NWS forecast and alerts.
Will it freeze in Winters in the next 7 nights?
No overnight lows at or below 32°F are forecast in Winters during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 48°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 48°F Above 36°F · Mostly Clear
- Fri, Nov 6 47°F Above 36°F · Clear
- Sat, Nov 7 49°F Above 36°F · Mostly Clear
- Sun, Nov 8 50°F Above 36°F · Partly Cloudy
- Mon, Nov 9 49°F Above 36°F · Mostly Clear
- Tue, Nov 10 50°F Above 36°F · Partly Cloudy then Slight Chance Light Rain
- Wed, Nov 11 49°F Above 36°F · Slight 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 Winters
The median first fall hard-freeze date (28°F) is December 15, from NOAA’s 1991–2020 Climate Normals at Winters. 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 24 · Mar 18 · Apr 13 | Nov 2 · Nov 15 · Nov 29 | 240 days |
| 32°F freeze | Jan 17 · Feb 18 · Mar 14 | Nov 15 · Nov 30 · Dec 18 | 284 days |
| 28°F hard freeze | Dec 18 · Jan 14 · Feb 17 | Nov 28 · Dec 15 · Jan 12 | 336 days |
Average high temperature by month
1991–2020 normals at Winters
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 Winters, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Winters (station USC00049742, elevation 135 ft), 0.6 mi from Winters. 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 Winters
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Dixon, CA | 9.9 mi | Feb 10 | Dec 1 |
| Vacaville, CA | 12 mi | Feb 18 | Nov 28 |
| Davis, CA | 13 mi | Feb 10 | Dec 1 |
| Woodland, CA | 16 mi | Feb 7 | Dec 5 |
| Fairfield, CA | 19 mi | Jan 15 | Dec 14 |
| Suisun City, CA | 20 mi | Jan 15 | Dec 14 |
| West Sacramento, CA | 23 mi | Feb 2 | Dec 2 |
| Napa, CA | 24 mi | Feb 12 | Dec 4 |
| St. Helena, CA | 27 mi | Feb 3 | Dec 4 |
| Sacramento, CA | 27 mi | Jan 12 | Dec 16 |
Frequently asked questions
When is the last frost in Winters?
On average, the last spring frost (32°F) in Winters is around February 18. In about 1 year in 10 it comes after March 14, and in 9 years in 10 it comes after January 17.
When is the first frost in Winters?
The first fall frost (32°F) usually arrives around November 30. There’s a 10% chance of a freeze by November 15 and a 90% chance by December 18.
Can it frost in Winters 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 18.
What growing zone is Winters?
Winters 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 95694. See growing zones in California.
More: all California frost dates · California growing zones · frost vs. freeze