How many chill hours does 91709 get?

91709 averages 370 chill hours per winter, ranging from 184 to 629 across the last 10 years.

What hardiness zone is 91709?

91709 is in USDA hardiness zone 10a.

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The short answer

91709 averages 370 chill hours per winter (184–629 across 10 years) in USDA zone 10a.

91709 climate
Average chill hours	370 (184–629 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 91709’s chill hours and zone:

Chill and zone requirements are comfortably met in 91709.

Show 13 more good fit varieties

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

How many chill hours does 91709 get?: 91709 averages 370 chill hours per winter, ranging from 184 to 629 across the last 10 years.
What hardiness zone is 91709?: 91709 is in USDA hardiness zone 10a.

Growing fruit trees in 91709? Get a care calendar anchored to this exact climate, with email reminders.

[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