Altadena, CA planting zone & frost dates
Altadena is in USDA hardiness zone 10b. Frost is rare here: in most years temperatures do not drop to 32°F.
USDA hardiness zone10bavg. extreme winter low 35°F to 40°F
FrostRarein most years the nearest weather station records no 32°F freeze
Hardiness zone by ZIP code in Altadena
- 91001 zone 10b
- 91003 zone 10b
Nearby cities
- Pasadena zone 10b
- La Cañada Flintridge zone 10a
- San Marino zone 10a
- South Pasadena zone 10a
- Sierra Madre zone 10a
- Alhambra zone 10a
- San Gabriel zone 10a
- Arcadia zone 10a
Questions
What growing zone is Altadena, CA?
Altadena is in USDA Plant Hardiness Zone 10b (average extreme winter low 35°F to 40°F), according to the USDA 2023 map.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Pasadena, CA (USC00046719), 4.8 km (3.0 mi) from the city center, elevation 263 m, based on 25 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.