Fontana, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fontana, a city in San Bernardino County, California.
Tonight
52°F
Mostly Clear
Mostly clear, with a low around 52. Northeast wind 0 to 5 mph.
7-day forecast for Fontana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Wednesday | 72°F | Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 55°F | Mostly Clear | 0 to 5 mph N | 0% |
| Thursday | 76°F | Sunny | 0 to 5 mph N | 0% |
| Thursday Night | 57°F | Mostly Clear | 5 to 15 mph N | 0% |
| Friday | 79°F | Sunny | 10 mph N | 0% |
| Friday Night | 58°F | Clear | 10 to 20 mph N | 0% |
| Saturday | 81°F | Sunny | 5 to 10 mph N | 0% |
| Saturday Night | 59°F | Mostly Clear | 5 to 20 mph N | 0% |
| Sunday | 82°F | Sunny | 0 to 10 mph NE | 0% |
| Sunday Night | 61°F | Partly Cloudy | 0 to 10 mph N | 0% |
| Monday | 80°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Monday Night | 60°F | Partly Cloudy | 0 mph | 1% |
| Tuesday | 78°F | Mostly Sunny | 0 mph | 2% |
Forecast source: National Weather Service (api.weather.gov) for Fontana (34.110, -117.463). Updated through the day.
Growing snapshot for Fontana
Last spring frost
Jan 4
First fall frost
Dec 30
Growing season
365 days
Hardiness zone
10a
More local growing data for Fontana: nearby ZIP 92335 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Ontario Intl Ap, Ca (8 mi from Fontana). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.