How many chill hours does 77003 get?

77003 averages 390 chill hours per winter, ranging from 171 to 496 across the last 10 years.

What hardiness zone is 77003?

77003 is in USDA hardiness zone 9b.

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The short answer

77003 averages 390 chill hours per winter (171–496 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 77003’s chill hours and zone:

Chill and zone requirements are comfortably met in 77003.

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

How many chill hours does 77003 get?: 77003 averages 390 chill hours per winter, ranging from 171 to 496 across the last 10 years.
What hardiness zone is 77003?: 77003 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