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Chill hours in 93630

The short answer

93630 averages 927 chill hours per winter (7251,391 across 10 years) in USDA zone 9a.
93630 climate
Average chill hours927 (725–1,391 across 10 winters)
USDA hardiness zone9a
Last spring frosttypically January 12 – February 24
First fall frosttypically November 21 – December 19

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 93630’s chill hours and zone:

How many chill hours does 93630 get?
93630 averages 927 chill hours per winter, ranging from 725 to 1391 across the last 10 years.
What hardiness zone is 93630?
93630 is in USDA hardiness zone 9a.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026