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Chill hours in 95633

The short answer

95633 averages 1,592 chill hours per winter (1,3511,989 across 10 years) in USDA zone 9a.
95633 climate
Average chill hours1,592 (1,351–1,989 across 10 winters)
USDA hardiness zone9a
Last spring frosttypically February 3 – April 17
First fall frosttypically November 3 – 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 95633’s chill hours and zone:

How many chill hours does 95633 get?
95633 averages 1592 chill hours per winter, ranging from 1351 to 1989 across the last 10 years.
What hardiness zone is 95633?
95633 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