How many chill hours does 85250 get?

85250 averages 363 chill hours per winter, ranging from 167 to 636 across the last 10 years.

What hardiness zone is 85250?

85250 is in USDA hardiness zone 9b.

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The short answer

85250 averages 363 chill hours per winter (167–636 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 85250’s chill hours and zone:

Chill and zone requirements are comfortably met in 85250.

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

How many chill hours does 85250 get?: 85250 averages 363 chill hours per winter, ranging from 167 to 636 across the last 10 years.
What hardiness zone is 85250?: 85250 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