How many chill hours does 90401 get?

90401 averages 203 chill hours per winter, ranging from 78 to 358 across the last 10 years.

What hardiness zone is 90401?

90401 is in USDA hardiness zone 11a.

Location almanac

The short answer

90401 averages 203 chill hours per winter (78–358 across 10 years) in USDA zone 11a.

90401 climate
Average chill hours	203 (78–358 across 10 winters)
USDA hardiness zone	11a

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 90401’s chill hours and zone:

Chill and zone requirements are comfortably met in 90401.

Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 90401 get?: 90401 averages 203 chill hours per winter, ranging from 78 to 358 across the last 10 years.
What hardiness zone is 90401?: 90401 is in USDA hardiness zone 11a.

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[1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
[2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026