How many chill hours does 91978 get?

91978 averages 760 chill hours per winter, ranging from 369 to 1232 across the last 10 years.

What hardiness zone is 91978?

91978 is in USDA hardiness zone 10b.

Location almanac

The short answer

91978 averages 760 chill hours per winter (369–1,232 across 10 years) in USDA 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 91978’s chill hours and zone:

Chill and zone requirements are comfortably met in 91978.

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

How many chill hours does 91978 get?: 91978 averages 760 chill hours per winter, ranging from 369 to 1232 across the last 10 years.
What hardiness zone is 91978?: 91978 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