How many chill hours does 78023 get?

78023 averages 509 chill hours per winter, ranging from 279 to 652 across the last 10 years.

What hardiness zone is 78023?

78023 is in USDA hardiness zone 8b.

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The short answer

78023 averages 509 chill hours per winter (279–652 across 10 years) in USDA zone 8b.

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 78023’s chill hours and zone:

Chill and zone requirements are comfortably met in 78023.

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

How many chill hours does 78023 get?: 78023 averages 509 chill hours per winter, ranging from 279 to 652 across the last 10 years.
What hardiness zone is 78023?: 78023 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