How many chill hours does 91301 get?

91301 averages 304 chill hours per winter, ranging from 179 to 585 across the last 10 years.

What hardiness zone is 91301?

91301 is in USDA hardiness zone 10b.

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The short answer

91301 averages 304 chill hours per winter (179–585 across 10 years) in USDA zone 10b.

91301 climate
Average chill hours	304 (179–585 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 91301’s chill hours and zone:

Chill and zone requirements are comfortably met in 91301.

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 91301 get?: 91301 averages 304 chill hours per winter, ranging from 179 to 585 across the last 10 years.
What hardiness zone is 91301?: 91301 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