How many chill hours does 85643 get?

85643 averages 1147 chill hours per winter, ranging from 724 to 1512 across the last 10 years.

What hardiness zone is 85643?

85643 is in USDA hardiness zone 8b.

Location almanac

The short answer

85643 averages 1,147 chill hours per winter (724–1,512 across 10 years) in USDA zone 8b.

85643 climate
Average chill hours	1,147 (724–1,512 across 10 winters)
USDA hardiness zone	8b
Last spring frost	typically February 13 – March 25
First fall frost	typically November 4 – December 11

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 85643’s chill hours and zone:

Chill and zone requirements are comfortably met in 85643.

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How many chill hours does 85643 get?: 85643 averages 1147 chill hours per winter, ranging from 724 to 1512 across the last 10 years.
What hardiness zone is 85643?: 85643 is in USDA hardiness zone 8b.

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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