How many chill hours does 92231 get?

92231 averages 120 chill hours per winter, ranging from 59 to 212 across the last 10 years.

What hardiness zone is 92231?

92231 is in USDA hardiness zone 10a.

Location almanac

The short answer

92231 averages 120 chill hours per winter (59–212 across 10 years) in USDA zone 10a.

92231 climate
Average chill hours	120 (59–212 across 10 winters)
USDA hardiness zone	10a

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 92231’s chill hours and zone:

Chill and zone requirements are comfortably met in 92231.

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

How many chill hours does 92231 get?: 92231 averages 120 chill hours per winter, ranging from 59 to 212 across the last 10 years.
What hardiness zone is 92231?: 92231 is in USDA hardiness zone 10a.

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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