How many chill hours does 77013 get?

77013 averages 370 chill hours per winter, ranging from 159 to 480 across the last 10 years.

What hardiness zone is 77013?

77013 is in USDA hardiness zone 9b.

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The short answer

77013 averages 370 chill hours per winter (159–480 across 10 years) in USDA zone 9b.

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 77013’s chill hours and zone:

Chill and zone requirements are comfortably met in 77013.

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

How many chill hours does 77013 get?: 77013 averages 370 chill hours per winter, ranging from 159 to 480 across the last 10 years.
What hardiness zone is 77013?: 77013 is in USDA hardiness zone 9b.

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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