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Will it freeze in Los Altos Hills in the next 7 nights?
No overnight lows at or below 32°F are forecast in Los Altos Hills during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 49°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 49°F Above 36°F · Mostly Clear
- Fri, Nov 6 50°F Above 36°F · Mostly Clear
- Sat, Nov 7 50°F Above 36°F · Mostly Clear
- Sun, Nov 8 51°F Above 36°F · Partly Cloudy
- Mon, Nov 9 51°F Above 36°F · Mostly Clear
- Tue, Nov 10 52°F Above 36°F · Partly Cloudy then Slight Chance Light Rain
- Wed, Nov 11 52°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 Los Altos Hills
The median first fall hard-freeze date (28°F) is January 4, from NOAA’s 1991–2020 Climate Normals at Skyline Ridge Preserve. 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 25 · Apr 26 · May 27 | Nov 4 · Nov 25 · Dec 15 | 212 days |
| 32°F freeze | Jan 19 · Mar 21 · Apr 28 | Nov 21 · Dec 15 · Jan 30 | 275 days |
| 28°F hard freeze | Dec 15 · Jan 29 · Mar 30 | Dec 3 · Jan 4 · Mar 9 | 361 days |
Average high temperature by month
1991–2020 normals at Skyline Ridge Preserve
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 Los Altos Hills, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Skyline Ridge Preserve (station USC00048273, elevation 2,270 ft), 4.5 mi from Los Altos Hills. 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 Los Altos Hills
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Palo Alto, CA | 1.9 mi | Feb 1 | Dec 7 |
| Los Altos, CA | 2.5 mi | Jan 6 | Dec 23 |
| Mountain View, CA | 3.7 mi | Jan 6 | Dec 23 |
| Cupertino, CA | 6.2 mi | Jan 6 | Dec 23 |
| Sunnyvale, CA | 6.2 mi | Jan 6 | Dec 23 |
| East Palo Alto, CA | 6.8 mi | Feb 1 | Dec 7 |
| Atherton, CA | 6.8 mi | Jan 17 | Dec 12 |
| Woodside, CA | 7.5 mi | Feb 25 | Nov 25 |
| Menlo Park, CA | 8.1 mi | Feb 1 | Dec 7 |
| Saratoga, CA | 9.3 mi | Feb 2 | Dec 6 |
Frequently asked questions
When is the last frost in Los Altos Hills?
On average, the last spring frost (32°F) in Los Altos Hills is around March 21. In about 1 year in 10 it comes after April 28, and in 9 years in 10 it comes after January 19.
When is the first frost in Los Altos Hills?
The first fall frost (32°F) usually arrives around December 15. There’s a 10% chance of a freeze by November 21 and a 90% chance by January 30.
Can it frost in Los Altos Hills 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 26.
What growing zone is Los Altos Hills?
Los Altos Hills 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 94022. See growing zones in California.
More: all California frost dates · California growing zones · frost vs. freeze