How many chill hours does 95603 get?

95603 averages 1421 chill hours per winter, ranging from 1265 to 1815 across the last 10 years.

What hardiness zone is 95603?

95603 is in USDA hardiness zone 9b.

Location almanac

The short answer

95603 averages 1,421 chill hours per winter (1,265–1,815 across 10 years) in USDA zone 9b.

95603 climate
Average chill hours	1,421 (1,265–1,815 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically February 3 – April 9
First fall frost	typically November 10 – December 10

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 95603’s chill hours and zone:

Chill and zone requirements are comfortably met in 95603.

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How many chill hours does 95603 get?: 95603 averages 1421 chill hours per winter, ranging from 1265 to 1815 across the last 10 years.
What hardiness zone is 95603?: 95603 is in USDA hardiness zone 9b.

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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