How many chill hours does 85131 get?

85131 averages 465 chill hours per winter, ranging from 259 to 687 across the last 10 years.

What hardiness zone is 85131?

85131 is in USDA hardiness zone 9a.

Location almanac

The short answer

85131 averages 465 chill hours per winter (259–687 across 10 years) in USDA zone 9a.

85131 climate
Average chill hours	465 (259–687 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 10 – February 17
First fall frost	typically December 2 – December 29

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 85131’s chill hours and zone:

Chill and zone requirements are comfortably met in 85131.

Show 36 more good fit varieties

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

How many chill hours does 85131 get?: 85131 averages 465 chill hours per winter, ranging from 259 to 687 across the last 10 years.
What hardiness zone is 85131?: 85131 is in USDA hardiness zone 9a.

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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