How many chill hours does 91963 get?

91963 averages 978 chill hours per winter, ranging from 508 to 1502 across the last 10 years.

What hardiness zone is 91963?

91963 is in USDA hardiness zone 9a.

Location almanac

The short answer

91963 averages 978 chill hours per winter (508–1,502 across 10 years) in USDA zone 9a.

91963 climate
Average chill hours	978 (508–1,502 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically February 3 – April 5
First fall frost	typically November 4 – December 30

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 91963’s chill hours and zone:

Chill and zone requirements are comfortably met in 91963.

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How many chill hours does 91963 get?: 91963 averages 978 chill hours per winter, ranging from 508 to 1502 across the last 10 years.
What hardiness zone is 91963?: 91963 is in USDA hardiness zone 9a.

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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