How many chill hours does 77517 get?

77517 averages 315 chill hours per winter, ranging from 129 to 430 across the last 10 years.

What hardiness zone is 77517?

77517 is in USDA hardiness zone 9b.

Location almanac

The short answer

77517 averages 315 chill hours per winter (129–430 across 10 years) in USDA zone 9b.

77517 climate
Average chill hours	315 (129–430 across 10 winters)
USDA hardiness zone	9b
Last spring frost	typically January 8 – February 20
First fall frost	typically November 13 – 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 77517’s chill hours and zone:

Chill and zone requirements are comfortably met in 77517.

Show 25 more good fit varieties

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

How many chill hours does 77517 get?: 77517 averages 315 chill hours per winter, ranging from 129 to 430 across the last 10 years.
What hardiness zone is 77517?: 77517 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