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Will it freeze in Mountain House in the next 7 nights?
No overnight lows at or below 32°F are forecast in Mountain House during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 51°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 51°F Above 36°F · Mostly Clear
- Fri, Nov 6 50°F Above 36°F · Mostly Clear
- Sat, Nov 7 53°F Above 36°F · Mostly Clear
- Sun, Nov 8 53°F Above 36°F · Mostly Clear
- Mon, Nov 9 52°F Above 36°F · Mostly Clear
- Tue, Nov 10 53°F Above 36°F · Mostly Clear
- Wed, Nov 11 53°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 Mountain House
The median first fall hard-freeze date (28°F) is December 22, from NOAA’s 1991–2020 Climate Normals at Tracy Pumping Plt. 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 | Jan 22 · Feb 21 · Mar 24 | Nov 13 · Nov 29 · Dec 13 | 283 days |
| 32°F freeze | Dec 25 · Jan 19 · Feb 17 | Nov 26 · Dec 10 · Jan 7 | 330 days |
| 28°F hard freeze | Dec 12 · Jan 1 · Jan 22 | Dec 4 · Dec 22 · Jan 10 | 361 days |
Average high temperature by month
1991–2020 normals at Tracy Pumping Plt
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 Mountain House, CA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Tracy Pumping Plt (station USC00049001, elevation 61 ft), 2.7 mi from Mountain House. 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 Mountain House
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Tracy, CA | 5.6 mi | Feb 25 | Nov 26 |
| Lathrop, CA | 12 mi | Feb 6 | Dec 1 |
| Livermore, CA | 14 mi | Feb 15 | Dec 2 |
| Brentwood, CA | 15 mi | Jan 12 | Dec 19 |
| Manteca, CA | 17 mi | Feb 6 | Dec 1 |
| Oakley, CA | 17 mi | Jan 12 | Dec 19 |
| Stockton, CA | 19 mi | Feb 5 | Dec 8 |
| Antioch, CA | 20 mi | Jan 12 | Dec 19 |
| Dublin, CA | 20 mi | Feb 15 | Dec 2 |
| Pleasanton, CA | 21 mi | Feb 15 | Dec 2 |
Frequently asked questions
When is the last frost in Mountain House?
On average, the last spring frost (32°F) in Mountain House is around January 19. In about 1 year in 10 it comes after February 17, and in 9 years in 10 it comes after December 25.
When is the first frost in Mountain House?
The first fall frost (32°F) usually arrives around December 10. There’s a 10% chance of a freeze by November 26 and a 90% chance by January 7.
Can it frost in Mountain House 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 February 21.
What growing zone is Mountain House?
Mountain House 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 95391. See growing zones in California.
More: all California frost dates · California growing zones · UV index today in Mountain House · frost vs. freeze