How many chill hours does 85021 get?

85021 averages 368 chill hours per winter, ranging from 177 to 599 across the last 10 years.

What hardiness zone is 85021?

85021 is in USDA hardiness zone 9b.

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The short answer

85021 averages 368 chill hours per winter (177–599 across 10 years) in USDA zone 9b.

85021 climate
Average chill hours	368 (177–599 across 10 winters)
USDA hardiness 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 85021’s chill hours and zone:

Chill and zone requirements are comfortably met in 85021.

Show 26 more good fit varieties

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

How many chill hours does 85021 get?: 85021 averages 368 chill hours per winter, ranging from 177 to 599 across the last 10 years.
What hardiness zone is 85021?: 85021 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