How many chill hours does 85323 get?

85323 averages 432 chill hours per winter, ranging from 278 to 645 across the last 10 years.

What hardiness zone is 85323?

85323 is in USDA hardiness zone 9b.

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The short answer

85323 averages 432 chill hours per winter (278–645 across 10 years) in USDA zone 9b.

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 85323’s chill hours and zone:

Chill and zone requirements are comfortably met in 85323.

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Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 85323 get?: 85323 averages 432 chill hours per winter, ranging from 278 to 645 across the last 10 years.
What hardiness zone is 85323?: 85323 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