Mountain House, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mountain House, a community in Alameda County, California.
Today
68°F
Sunny
Sunny. High near 68, with temperatures falling to around 65 in the afternoon. West northwest wind 6 to 14 mph, with gusts as high as 23 mph.
7-day forecast for Mountain House
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Sunny | 6 to 14 mph WNW | 1% |
| Tonight | 52°F | Mostly Cloudy | 7 mph WSW | 1% |
| Thursday | 71°F | Mostly Sunny | 3 to 12 mph WNW | 0% |
| Thursday Night | 52°F | Clear | 3 mph WSW | 0% |
| Friday | 72°F | Sunny | 1 to 6 mph NW | 0% |
| Friday Night | 52°F | Mostly Clear | 2 mph NW | 0% |
| Saturday | 74°F | Sunny | 0 to 3 mph NNE | 0% |
| Saturday Night | 53°F | Mostly Clear | 2 mph W | 0% |
| Sunday | 73°F | Sunny | 5 mph WNW | 0% |
| Sunday Night | 54°F | Partly Cloudy | 2 mph W | 0% |
| Monday | 73°F | Mostly Sunny | 1 to 5 mph WNW | 0% |
| Monday Night | 53°F | Partly Cloudy | 3 mph WSW | 1% |
| Tuesday | 73°F | Sunny | 1 to 5 mph WNW | 4% |
| Tuesday Night | 53°F | Mostly Clear | 3 mph WSW | 9% |
Forecast source: National Weather Service (api.weather.gov) for Mountain House (37.767, -121.545). Updated through the day.
Growing snapshot for Mountain House
Last spring frost
Jan 19
First fall frost
Dec 10
Growing season
330 days
Hardiness zone
9b
More local growing data for Mountain House: nearby ZIP 95391 weather · frost dates · planting calendar · California frost dates
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Union City
Climate data from the nearest NOAA station, Tracy Pumping Plt, Ca (1.3 mi from Mountain House). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.