How many chill hours does 85321 get?

85321 averages 721 chill hours per winter, ranging from 386 to 1117 across the last 10 years.

What hardiness zone is 85321?

85321 is in USDA hardiness zone 9b.

Location almanac

The short answer

85321 averages 721 chill hours per winter (386–1,117 across 10 years) in USDA zone 9b.

85321 climate
Average chill hours	721 (386–1,117 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 12 – March 2
First fall frost	typically December 14 – December 28

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 85321’s chill hours and zone:

Chill and zone requirements are comfortably met in 85321.

Show 66 more good fit varieties

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

How many chill hours does 85321 get?: 85321 averages 721 chill hours per winter, ranging from 386 to 1117 across the last 10 years.
What hardiness zone is 85321?: 85321 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