How many chill hours does 94503 get?

94503 averages 1232 chill hours per winter, ranging from 1019 to 1809 across the last 10 years.

What hardiness zone is 94503?

94503 is in USDA hardiness zone 9b.

Location almanac

The short answer

94503 averages 1,232 chill hours per winter (1,019–1,809 across 10 years) in USDA zone 9b.

94503 climate
Average chill hours	1,232 (1,019–1,809 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 12 – March 16
First fall frost	typically November 29 – December 18

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 94503’s chill hours and zone:

Chill and zone requirements are comfortably met in 94503.

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How many chill hours does 94503 get?: 94503 averages 1232 chill hours per winter, ranging from 1019 to 1809 across the last 10 years.
What hardiness zone is 94503?: 94503 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