How many chill hours does 78623 get?

78623 averages 545 chill hours per winter, ranging from 258 to 773 across the last 10 years.

What hardiness zone is 78623?

78623 is in USDA hardiness zone 9a.

Location almanac

The short answer

78623 averages 545 chill hours per winter (258–773 across 10 years) in USDA zone 9a.

78623 climate
Average chill hours	545 (258–773 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 11 – March 6
First fall frost	typically November 12 – December 23

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 78623’s chill hours and zone:

Chill and zone requirements are comfortably met in 78623.

Show 48 more good fit varieties

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

How many chill hours does 78623 get?: 78623 averages 545 chill hours per winter, ranging from 258 to 773 across the last 10 years.
What hardiness zone is 78623?: 78623 is in USDA hardiness zone 9a.

Growing fruit trees in 78623? 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