How many chill hours does 91934 get?

91934 averages 966 chill hours per winter, ranging from 564 to 1448 across the last 10 years.

What hardiness zone is 91934?

91934 is in USDA hardiness zone 9b.

Location almanac

The short answer

91934 averages 966 chill hours per winter (564–1,448 across 10 years) in USDA zone 9b.

91934 climate
Average chill hours	966 (564–1,448 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 8 – March 1
First fall frost	typically December 9 – December 28

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 91934’s chill hours and zone:

Chill and zone requirements are comfortably met in 91934.

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How many chill hours does 91934 get?: 91934 averages 966 chill hours per winter, ranging from 564 to 1448 across the last 10 years.
What hardiness zone is 91934?: 91934 is in USDA hardiness zone 9b.

Growing fruit trees in 91934? 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