How many chill hours does 90603 get?

90603 averages 321 chill hours per winter, ranging from 185 to 615 across the last 10 years.

What hardiness zone is 90603?

90603 is in USDA hardiness zone 10b.

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The short answer

90603 averages 321 chill hours per winter (185–615 across 10 years) in USDA zone 10b.

90603 climate
Average chill hours	321 (185–615 across 10 winters)
USDA hardiness zone	10b

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 90603’s chill hours and zone:

Chill and zone requirements are comfortably met in 90603.

Show 12 more good fit varieties

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

How many chill hours does 90603 get?: 90603 averages 321 chill hours per winter, ranging from 185 to 615 across the last 10 years.
What hardiness zone is 90603?: 90603 is in USDA hardiness zone 10b.

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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