How many chill hours does 78233 get?

78233 averages 454 chill hours per winter, ranging from 238 to 589 across the last 10 years.

What hardiness zone is 78233?

78233 is in USDA hardiness zone 9a.

Location almanac

The short answer

78233 averages 454 chill hours per winter (238–589 across 10 years) in USDA zone 9a.

78233 climate
Average chill hours	454 (238–589 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 17 – 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 78233’s chill hours and zone:

Chill and zone requirements are comfortably met in 78233.

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 78233 get?: 78233 averages 454 chill hours per winter, ranging from 238 to 589 across the last 10 years.
What hardiness zone is 78233?: 78233 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