Castaic, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castaic, a community in Los Angeles County, California.
Today
94°F
Sunny
Sunny, with a high near 94. Southwest wind 0 to 15 mph, with gusts as high as 20 mph.
7-day forecast for Castaic
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 94°F | Sunny | 0 to 15 mph SW | 0% |
| Tonight | 60°F | Mostly Clear | 0 to 10 mph NW | 0% |
| Wednesday | 94°F | Sunny | 0 to 10 mph SSW | 0% |
| Wednesday Night | 61°F | Clear | 0 to 10 mph WNW | 0% |
| Thursday | 94°F | Sunny | 0 to 10 mph W | 0% |
| Thursday Night | 65°F | Clear | 0 to 10 mph W | 0% |
| Friday | 96°F | Sunny | 0 to 10 mph S | 0% |
| Friday Night | 66°F | Clear | 0 to 10 mph W | 0% |
| Saturday | 97°F | Sunny | 0 to 10 mph SSW | 0% |
| Saturday Night | 67°F | Clear | 0 to 10 mph W | 0% |
| Sunday | 95°F | Sunny | 0 to 15 mph SW | 0% |
| Sunday Night | 65°F | Mostly Clear | 0 to 15 mph W | 0% |
| Monday | 90°F | Sunny | 0 to 15 mph SSW | 1% |
| Monday Night | 62°F | Mostly Clear | 0 to 15 mph W | 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 Aug 4, 2026.