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Will it freeze in Williams in the next 7 nights?
No overnight lows at or below 32°F are forecast in Williams during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 46°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 46°F Above 36°F · Mostly Clear
- Fri, Nov 6 44°F Above 36°F · Mostly Clear
- Sat, Nov 7 47°F Above 36°F · Mostly Clear
- Sun, Nov 8 47°F Above 36°F · Partly Cloudy
- Mon, Nov 9 46°F Above 36°F · Mostly Clear
- Tue, Nov 10 48°F Above 36°F · Partly Cloudy
- Wed, Nov 11 47°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 Williams
The median first fall hard-freeze date (28°F) is December 15, from NOAA’s 1991–2020 Climate Normals at Colusa 2 Ssw. 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 21 · Mar 31 · Apr 22 | Oct 28 · Nov 12 · Nov 30 | 228 days |
| 32°F freeze | Jan 2 · Feb 14 · Mar 31 | Nov 11 · Dec 1 · Dec 26 | 293 days |
| 28°F hard freeze | Dec 11 · Jan 8 · Feb 20 | Nov 24 · Dec 15 · Jan 17 | 342 days |
Average high temperature by month
1991–2020 normals at Colusa 2 Ssw
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 Williams, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Colusa 2 Ssw (station USC00041948, elevation 50 ft), 6.5 mi from Williams. 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 Williams
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Colusa, CA | 7.5 mi | Feb 14 | Dec 1 |
| Willows, CA | 25 mi | Feb 21 | Dec 6 |
| Yuba City, CA | 27 mi | Jan 15 | Dec 12 |
| Live Oak, CA | 27 mi | Jan 15 | Dec 12 |
| Gridley, CA | 28 mi | Jan 29 | Dec 7 |
| Clearlake, CA | 30 mi | Apr 10 | Nov 6 |
| Marysville, CA | 30 mi | Jan 15 | Dec 12 |
| Oroville, CA | 39 mi | Jan 30 | Dec 13 |
| Woodland, CA | 39 mi | Feb 7 | Dec 5 |
| Orland, CA | 41 mi | Feb 25 | Dec 2 |
Frequently asked questions
When is the last frost in Williams?
On average, the last spring frost (32°F) in Williams is around February 14. In about 1 year in 10 it comes after March 31, and in 9 years in 10 it comes after January 2.
When is the first frost in Williams?
The first fall frost (32°F) usually arrives around December 1. There’s a 10% chance of a freeze by November 11 and a 90% chance by December 26.
Can it frost in Williams 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 31.
What growing zone is Williams?
Williams 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 95987. See growing zones in California.
More: all California frost dates · California growing zones · frost vs. freeze