Castaic, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castaic, a community in Los Angeles County, California.
Overnight
49°F
Clear
Clear, with a low around 49. North wind around 15 mph, with gusts as high as 20 mph.
7-day forecast for Castaic
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Clear | 15 mph N | 0% |
| Wednesday | 72°F | Sunny | 10 to 15 mph N | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 15 mph NNE | 0% |
| Thursday | 74°F | Mostly Sunny | 10 to 15 mph NNE | 0% |
| Thursday Night | 54°F | Mostly Clear | 10 to 20 mph NNE | 0% |
| Friday | 76°F | Sunny | 10 to 20 mph NNE | 0% |
| Friday Night | 55°F | Clear | 10 to 25 mph NNE | 0% |
| Saturday | 77°F | Sunny | 10 to 15 mph NNE | 0% |
| Saturday Night | 55°F | Clear | 5 to 20 mph NNE | 0% |
| Sunday | 78°F | Sunny | 5 to 10 mph NE | 0% |
| Sunday Night | 56°F | Mostly Clear | 5 to 15 mph NNE | 0% |
| Monday | 78°F | Sunny | 5 mph NE | 0% |
| Monday Night | 55°F | Partly Cloudy | 5 to 10 mph NNW | 1% |
| Tuesday | 77°F | Sunny | 0 to 5 mph ENE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Castaic (34.477, -118.633). Updated through the day.
Growing snapshot for Castaic
Last spring frost
Jan 8
First fall frost
Jan 1
Growing season
365 days
Hardiness zone
10a
More local growing data for Castaic: nearby ZIP 91384 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Newhall 5Nw, Ca (9.7 mi from Castaic). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.