How many chill hours does 85173 get?

85173 averages 624 chill hours per winter, ranging from 311 to 900 across the last 10 years.

What hardiness zone is 85173?

85173 is in USDA hardiness zone 9b.

Location almanac

The short answer

85173 averages 624 chill hours per winter (311–900 across 10 years) in USDA zone 9b.

85173 climate
Average chill hours	624 (311–900 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 26 – February 25
First fall frost	typically November 30 – December 30

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 85173’s chill hours and zone:

Chill and zone requirements are comfortably met in 85173.

Show 54 more good fit varieties

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

Show 3 more marginal varieties

How many chill hours does 85173 get?: 85173 averages 624 chill hours per winter, ranging from 311 to 900 across the last 10 years.
What hardiness zone is 85173?: 85173 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