How many chill hours does 85631 get?

85631 averages 681 chill hours per winter, ranging from 364 to 1003 across the last 10 years.

What hardiness zone is 85631?

85631 is in USDA hardiness zone 9a.

Location almanac

The short answer

85631 averages 681 chill hours per winter (364–1,003 across 10 years) in USDA zone 9a.

85631 climate
Average chill hours	681 (364–1,003 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically February 6 – February 26
First fall frost	typically December 2 – December 25

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 85631’s chill hours and zone:

Chill and zone requirements are comfortably met in 85631.

Show 55 more good fit varieties

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

Show 2 more marginal varieties

How many chill hours does 85631 get?: 85631 averages 681 chill hours per winter, ranging from 364 to 1003 across the last 10 years.
What hardiness zone is 85631?: 85631 is in USDA hardiness zone 9a.

Growing fruit trees in 85631? Get a care calendar anchored to this exact climate, with email reminders.

[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