Castaic, CA planting zone & frost dates
Castaic is in USDA hardiness zone 10a. Frost is rare here: in most years temperatures do not drop to 32°F.
USDA hardiness zone10aavg. extreme winter low 30°F to 35°F
FrostRarein most years the nearest weather station records no 32°F freeze
Useful for zone 10a gardens
- Drip irrigation kit — saves water in long, hot seasons
- Shade cloth — protects plants from midday sun
- Soil moisture meter
- Plants for zone 10
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Hardiness zone by ZIP code in Castaic
- 91310 zone 10a
- 91384 zone 10a
Nearby cities
- Valencia zone 10a
- Stevenson Ranch zone 10a
- Santa Clarita zone 10a
- Simi Valley zone 10a, last frost Jan 24
- Fillmore zone 10a
- Moorpark zone 10a
- Oak Park zone 10b, last frost Jan 24
- Agoura zone 10b, last frost Jan 24
Questions
What growing zone is Castaic, CA?
Castaic is in USDA Plant Hardiness Zone 10a (average extreme winter low 30°F to 35°F), according to the USDA 2023 map.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Newhall 5Nw, CA (USC00046161), 11.0 km (6.8 mi) from the city center, elevation 538 m, based on 16 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.