How many chill hours does 95221 get?

95221 averages 1476 chill hours per winter, ranging from 1301 to 1861 across the last 10 years.

What hardiness zone is 95221?

95221 is in USDA hardiness zone 9a.

Location almanac

The short answer

95221 averages 1,476 chill hours per winter (1,301–1,861 across 10 years) in USDA zone 9a.

95221 climate
Average chill hours	1,476 (1,301–1,861 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically February 3 – April 8
First fall frost	typically November 16 – December 17

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 95221’s chill hours and zone:

Chill and zone requirements are comfortably met in 95221.

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How many chill hours does 95221 get?: 95221 averages 1476 chill hours per winter, ranging from 1301 to 1861 across the last 10 years.
What hardiness zone is 95221?: 95221 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