How many chill hours does 93603 get?

93603 averages 1469 chill hours per winter, ranging from 1048 to 1900 across the last 10 years.

What hardiness zone is 93603?

93603 is in USDA hardiness zone 9b.

Location almanac

The short answer

93603 averages 1,469 chill hours per winter (1,048–1,900 across 10 years) in USDA zone 9b.

93603 climate
Average chill hours	1,469 (1,048–1,900 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically March 5 – April 12
First fall frost	typically November 10 – December 5

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 93603’s chill hours and zone:

Chill and zone requirements are comfortably met in 93603.

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How many chill hours does 93603 get?: 93603 averages 1469 chill hours per winter, ranging from 1048 to 1900 across the last 10 years.
What hardiness zone is 93603?: 93603 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