How many chill hours does 85331 get?

85331 averages 475 chill hours per winter, ranging from 203 to 831 across the last 10 years.

What hardiness zone is 85331?

85331 is in USDA hardiness zone 9b.

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The short answer

85331 averages 475 chill hours per winter (203–831 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 85331’s chill hours and zone:

Chill and zone requirements are comfortably met in 85331.

Show 36 more good fit varieties

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

Show 19 more marginal varieties

How many chill hours does 85331 get?: 85331 averages 475 chill hours per winter, ranging from 203 to 831 across the last 10 years.
What hardiness zone is 85331?: 85331 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